List of garden plants in North America

• Abelia • Abeliophyllum (white forsythia) • Abelmoschus (okra) • Abies (fir) • Abroma • Abromeitiella (obsolete) • Abronia (sand verbena) • Abrus • Abutilon • Acacia (wattle) • Acaena • Acalypha • Acanthaceae • Acanthodium • Acantholimon • Acanthopale • Acanthophoenix • Acanthus • Acca • Acer (maple) • Achariaceae • Achillea (yarrow) • Achimenantha (hybrid genus) • Achimenes • Acinos (calamint) • Aciphylla • Acmena • Acoelorraphe (saw palm) • Acokanthera • Aconitum (aconite, monkshood) • Acorus • Acradenia • Acrocomia • Actaea (baneberry) • Actinidia (kiwifruit) • Ada orchid genus • Adansonia • Adenandra • Adenanthos • Adenia • Adenium • Adenocarpus • Adenophora • Adenostoma • Adiantum (maidenhair fern) • Adlumia • Adonis • Adromischus • Aechmea • Aegopodium • Aeonium • Aerangis (an orchid genus) • Aerides (an orchid genus) • Aeschynanthus • Aesculus • Aethionema • Afgekia • Agapanthus • Agapetes • Agastache • Agathis • Agathosma • Agave • Ageratum • Aglaia • Aglaomorpha • Aglaonema • Agonis • Agrimonia • Agrostemma (corn cockle) • Agrostis • Aichryson • Ailanthus (tree of heaven, etc.) • Aiphanes • Aira (hair grass) • Ajania • Ajuga (bugleweed) • Akebia • Alangium • Alberta • Albizia (silk tree) • Albuca • Alcea (hollyhock) • Alchemilla • Aldrovanda • Aleurites • × Aliceara (hybrid genus) • Alisma (water plantain) • Alkanna • Allagoptera • Allamanda • Allium (onion) • Allocasuarina • Allosyncarpia • Alloxylon • Alluaudia • Alnus (alder) • Alocasia • Aloe • Aloinopsis • Alonsoa • Alopecurus (foxtail grass) • Aloysia • Alphitonia • Alpinia (ginger lily) • Alsobia • Alstonia • Alstroemeria • Alternanthera • Althaea • Alyogyne • Alyssum • Alyxia • Amaranthus • Amarcrinum (hybrid genus) • Amarygia (hybrid genus) • Amaryllis • Amberboa • Amelanchier • Amesiella • Amherstia • Amicia • Ammi • Ammobium • Amorpha • Amorphophallus • Ampelopsis • Amsonia • Anacampseros • Anacardium • Anacyclus • Anagallis (pimpernel) • Ananas (pineapple) • Anaphalis • Anchusa • Andersonia • Andira • Androlepis • Andromeda • Andropogon • Androsace • Anemone (windflower) • Anemonella • Anemonopsis • Anemopaegma • Anethum (dill) • Angelica • Angelonia • Angiopteris • Angophora • Angraecum (an orchid genus) • Anguloa (an orchid genus) • Angulocaste (a hybrid orchid genus) • Anigozanthos • Anisacanthus • Anisodontea • Annona • Anoda • Anomatheca (See Freesia) • Anopterus • Anredera • Antennaria • Anthemis • Anthericum • Anthocleista • Anthotroche • Anthriscus • Anthurium • Anthyllis • Antidesma • Antigonon • Antirrhinum (snapdragon) • Apera • Aphelandra • Aphyllanthes • Apium • Apocynum • Aponogeton • Apophyllum • Apodytes • Aponogeton • Aporocactus • Aporoheliocereus (hybrid genus) • Aprevalia • Aptenia, synonym of Mesembryanthemum • Aquilegia (columbine) • Arabis (rock cress) • Arachis • Arachniodes • Arachnis (scorpion orchid) (orchid genus) • Araeococcus • Araiostegia • Aralia • Araucaria (monkey-puzzle) • Araujia • Arbutus (madrone) • Archidendron • Archontophoenix (king palm) • Arctium • Arctostaphylos (bearberry, manzanita) • Arctotheca • Arctotis (African daisy) • Ardisia • Areca • Arenaria (sandwort) • Arenga • Argemone (prickly poppy) • Argyranthemum • Argyreia • Argyroderma • Ariocarpus • Arisaema • Arisarum • Aristea • Aristolochia • Aristotelia • Armeria • Armoracia • Arnebia • Arnica • Aronia (chokeberry) • Arrabidaea, see Bignonia magnifica • Arrhenatherum (oat grass) • Artanema • Artabotrys • Artemisia (mugwort, sagebrush, wormwood) • Arthrocereus • Arthropodium • Artocarpus • Arum • Aruncus • Arundina • Arundinaria • Arundo • Asarina • Asarum (wild ginger) • Asclepias (milkweed, silkweed) • × Ascocenda (hybrid genus) (an orchid genus) • Ascocentrum an orchid genus • Asimina • Asparagus • Asperula (woodruff) • Asphodeline • Asphodelus (asphodel) • Aspidistra • Asplenium • Astelia • Aster • Asteranthera • Astilbe • Astilboides • Astragalus (milk vetch) • Astrantia • Astrophytum • Asystasia • Atalaya • Athamanta • Atherosperma • Athrotaxis • Athyrium • Atriplex • Attalea • Aubrieta • Aucuba • Aulax • Auranticarpa • Aurinia • Austrocedrus • Austrocylindropuntia • Austrostipa • Averrhoa • Avicennia • Azadirachta • Azalea • Azara • Azolla (aquatic ferns) • Azorella • Azorina • Aztekium • Azetura == B ==

• Babiana • Baccharis • Backhousia • Bacopa (water hyssop) • Bactris • Baeckea • Baikiaea • Baileya • Ballota • Balsamorhiza (balsam root) • Bambusa (bamboo) • Banksia • Baptisia an orchid genus • Barbarea (yellow rocket or winter cress) • Barkeria (an orchid genus) • Barleria • Barklya (gold blossom tree) • Barnadesia • Barringtonia • Bartlettina • Basselinia • Bassia • Bauera • Bauhinia • Baumea • × Beallara an orchid hybrid genus • Beaucarnea • Beaufortia • Beaumontia • Beccariella • Bedfordia • Begonia • Belamcanda • Bellevalia • Bellis (daisy) • Bellium • Berberidopsis • Berberis (barberry) • Berchemia • Bergenia • Bergerocactus • Berkheya • Berlandiera • Berrya • Bertolonia • Berzelia • Beschorneria • Bessera • Beta (beet) • Betula (birch) • Biarum • Bidens • Bignonia • Bikkia • Billardiera • Billbergia • Bischofia • Bismarckia • Bixa • Blandfordia • Blechnum (hard fern) • Bletilla (an orchid genus) • Blighia • Bloomeria • Blossfeldia • Bocconia • Boenninghausenia • Bolax • Bolbitis • Bollea (an orchid genus) • Boltonia • Bolusanthus • Bomarea • Bombax • Bongardia • Boophone • Borago • Borassodendron • Borassus • Boronia • Bosea • Bossiaea • Bothriochloa • Bougainvillea • Bouteloua • Bouvardia • Bowenia • Bowiea • Bowkeria • Boykinia • Brabejum • Brachychiton • Brachyglottis • Brachylaena • Brachypodium • Brachyscome • Brachysema • Brachystelma • Bracteantha • Brahea (hesper palm) • Brassavola (an orchid genus) • Brassaia (octopus tree) • Brassia (an orchid genus) • Brassica (mustard, cabbage) • × Brassidium (hybrid orchids) • × Brassocattleya (hybrid orchids) • × Brassolaeliocattleya (trigeneric hybrid orchids) • Breynia • Brillantaisia • Brimeura • Briza (quaking grass) • Brodiaea • Bromelia • Broughtonia an orchid genus • Broussonetia • Browallia • Brownea • Browningia • Bruckenthalia • Brugmansia • Brunfelsia • Brunia • Brunnera • Brunsvigia • Brya • Buchloe • Buckinghamia • Buddleja • Buglossoides • Bulbine • Bulbinella • Bulbocodium • Bulbophyllum (an orchid genus) • Bulnesia • Bunchosia • Buphthalmum • Bupleurum • Burchardia • Burchellia • × Burrageara an orchid hybrid genus • Burretiokentia • Bursaria • Bursera • Burtonia • Butea • Butia • Butomus • Buxus (boxwood) • Byrsonima • Bystropogon == C ==

• Cabomba • Cadia • Caesalpinia (dwarf poinciana, Pride of Barbados) • Caladium • Calamagrostis (reed grass, smallweed) • Calamintha (calamint) • Calamus • Calandrinia • Calanthe an orchid genus • Calathea • Calceolaria (slipperwort) • Calendula (pot marigold) • Calibanus • Calibrachoa • Calla • Calliandra • Callianthemum • Callicarpa (beauty berry) • Callicoma (black wattle) • Callirhoe (poppy mallow) • Callisia • Callistemon (bottlebrush) • Callistephus (Chinese aster) • Callitriche (water starwort) • Callitris (cypress pine) • Calluna (heather) • Calocedrus (incense cedar) • Calochone • Calochortus • Calodendrum (cape chestnut) • Calomeria • Calophaca • Calophyllum • Calopyxis • Caloscordum • Calothamnus • Calotropis • Calpurnia • Caltha (kingcup, marsh marigold) • Calycanthus • Calymmanthium • Calypso (an orchid genus) • Calytrix (starflower) • Camassia (quamash) • Camellia • Camoensia • Campanula (bellflower) • Campsis (trumpet vine) • Campylotropis (See Lespedeza) • Cananga (ylang ylang) • Canarina • Canistrum • Canna • Cantua • Capparis • Capsicum (pepper) • Caragana (peashrub) • Caralluma • Cardamine (bittercress) • Cardiocrinum • Cardiospermum • Cardwellia • Carex (sedge) • Carissa • Carlina • Carludovica • Carmichaelia • Carnegiea (saguaro) • Carpentaria • Carphalea • Carpinus (hornbeam) • Carpobrotus • Carthamus (safflower) • Carum (caraway) • Carya (hickory, pecan) • Caryopteris • Caryota (fishtail palm) • Cassia (shower tree) • Cassinia • Cassiope • Cassipourea • Castanea (chestnut) • Castanopsis • Castanospermum (black bean) • Casuarina (sheoak) • Catalpa (Indian bean) • Catananche • Catasetum (an orchid genus) • Catha (khat tree) • Catharanthus (Madagascar periwinkle) • Catopsis • Cattleya (an orchid genus) • Caulophyllum • Cautleya • Cavendishia • Ceanothus (California-lilac) • Cedrela (toon) • Cedronella • Cedrus (cedar) • Ceiba (kapok) • Celastrus (staff-vine) • Celmisia (New Zealand daisy, New Zealand aster) • Celosia (cockscomb) • Celtis (hackberry) • Centaurea • Centaurium • Centradenia • Centranthus (valerian) • Cephalaria • Cephalocereus • Cephalophyllum • Cephalotaxus (plum-yew) • Ceraria • Cerastium • Ceratonia (St. John's bread, carob bean) • Ceratopetalum (coachwood) • Ceratophyllum • Ceratopteris • Ceratostigma • Ceratozamia • Cerbera (sea mango) • Cercidiphyllum • Cercis (Judas tree, redbud) • Cercocarpus • Cereus • Ceropegia • Cestrum • Chadsia • Chaenomeles (flowering quince) • Chaenorhinum (dwarf snapdragon) • Chaerophyllum • Chamaecyparis (false cypress) • Chamaecytisus • Chamaedaphne • Chamaedorea • Chamaelirium • Chamaemelum (chamomile) • Chamaerops • Chamelaucium (wax flower) • Chasmanthe • Chasmanthium • Cheilanthes • Cheiridopsis • Chelidonium • Chelone (turtlehead) • Chiastophyllum • Chiliotrichum • Chilopsis (desert willow) • Chimaphila • Chimonanthus (wintersweet) • Chimonobambusa • Chionanthus (fringe tree) • Chionochloa • Chirita • Chlidanthus • Choisya • Chonemorpha (Frangipani vine) • Choricarpia (brush turpentine) • Chorisia (floss silk tree) • Chorizema • Chrysalidocarpus • Chrysanthemoides • Chrysanthemum • Chrysobalanus • Chrysogonum • Chrysolepis • Chrysophyllum (star apple) • Chrysothemis • Chusquea • Cibotium • Cicerbita • Cichorium (chicory, endive) • Cimicifuga (bugbane) • Cinnamomum (camphor laurel) • Cionura • Cirsium • Cissus • Cistus (rock rose, sun rose) • Citharexylum (fiddlewood) • Citrofortunella (hybrid) • Citrus (lime, lemon) • Cladanthus • Cladrastis • Clarkia • Claytonia • Cleistocactus • Clematis • Cleome (spider flower) • Clerodendrum • Clethra (summersweet) • Cleyera • Clianthus • Clintonia • Clitoria • Clivia • Clusia • Clytostoma • Cobaea • Coccoloba (sea grape) • Coccothrinax (thatch palm) • Cocculus • Cochlioda an orchid genus – synonym of Oncidium • Cochlospermum (buttercup tree, Maximiliana) • Cocos (coconut) • Codiaeum (croton) • Codonanthe • Codonopsis • Coelia • Coelogyne (an orchid genus) • Coffea (coffee tree) • Coix • Colchicum (autumn crocus, meadow saffron) • Coleonema • Colletia • Collinsia • Collomia • Colocasia (taro) • Colquhounia • Columnea • Colutea (bladder senna) • Coluteocarpus • Colvillea • Combretum • Comesperma • Commelina (day flower, spiderwort, widow's tears) • Commersonia • Commidendrum • Commiphora • Comptonella • Comptonia (Sweetfern) • Conandron • Congea • Conicosia • Coniogramme • Conoclinium (mistflower) • Conophytum • Conospermum • Conostylis • Conradina • Consolida (larkspur) • Convallaria (lily-of-the-valley) • Convolvulus (bindweed, morning glory) • Copernicia (caranda palm, wax palm) • Copiapoa syn. Pilocopiapoa • Coprosma • Coptis (goldthread) • Cordia (bird lime tree) • Cordyline • Coreopsis (tickseed) • Coriandrum (coriander cilantro) • Coriaria • Cornus (dogwood, cornel) • Corokia • Coronilla • Correa • Corryocactus • Cortaderia (pampas grass, tussock grass) • Cortusa • Corybas (helmet orchid) • Corydalis • Corylopsis (winter-hazel) • Corylus (hazel, filbert) • Corymbia • Corynocarpus • Corypha • Coryphantha • Cosmos • Costus • Cotinus (smoke bush) • Cotoneaster • Cotula (brass buttons) • Cotyledon • Couroupita (cannonball tree) • Crambe • Craspedia • Crassula • + Crataegomespilus (graft chimera) • Crataegus (hawthorn) • × Crataemespilus (hybrid) • Crepis • Crescentia (calabash) • Crinodendron • Crinum • Crocosmia (falling stars, montbretia) • Crocus • Crossandra (firecracker flower) • Crotalaria (rattlepod) • Croton • Crowea • Cryptanthus (earth stars) • Cryptbergia (hybrid) • Cryptocarya • Cryptocoryne (water trumpet) • Cryptomeria (sugi, Japanese cedar) • Cryptostegia (Indian rubber vine) • Cryptotaenia • Ctenanthe • Cucumis • Cucurbita • Cuminum • Cunila • Cunninghamia (China-fir) • Cunonia • Cupaniopsis (tuckeroo) • Cuphea • Cupressus (cypress) • Cuprocyparis (hybrid) • Curcuma • Cussonia • Cyananthus (trailing bellflower) • Cyanotis • Cyathea (tree fern) • Cyathodes • Cybistax • Cycas (cycad, sago palm) • Cyclamen • Cycnoches an orchid genus • Cydista, synonym of Bignonia • Cydonia (quince) • Cylindropuntia • Cymbalaria (ivy-leaved toadflax) • Cymbidium (an orchid genus) • Cymbopogon • Cynara • Cynodon • Cynoglossum (hound's tongue) • Cypella • Cyperus • Cyphomandra (tree tomato) • Cyphostemma • Cypripedium (lady's slipper; an orchid genus) • Cyrilla • Cyrtanthus (fire lily) • Cyrtomium • Cyrtostachys • Cystopteris (bladder fern) • Cytisus (broom) == D ==

• Daboecia • Dacrydium • Dactylis • Dactylorhiza (marsh orchid) • Dahlia • Dalea (indigo bush) • Dalechampia • Damasonium • Dampiera • Danae • Daphne • Daphniphyllum • Darlingia • Darmera syn. Peltiphyllum • Darwinia (lemon scented myrtle) • Dasylirion • Datura • Davallia (hare's foot fern) • Davidia • Daviesia • Decaisnea • × Degarmoara (a hybrid orchid genus) • Decarya • Decumaria • Deinanthe • Delairea • Delonix • Delosperma • Delphinium • Dendranthema • Dendrobium (an orchid genus) • Dendrocalamus • Dendrochilum (an orchid genus) • Dendromecon (tree poppy) • Denmoza • Dennstaedtia (Hayscented fern or Cup fern) • Deppea • Derris • Derwentia • Deschampsia (hair grass) • Desfontainia • Desmodium • Deuterocohnia syn. Abromeitiella • Deutzia • Dianella (flax lily) • Dianthus (carnation, pink) • Diascia (twinspur) • Dicentra (bleeding heart) • Dichelostemma • Dichondra • Dichorisandra • Dichroa • Dicksonia • Dicliptera • Dictamnus (burning bush, dittany) • Dictyosperma (princess palm) • Didymochlaena • Dieffenbachia (dumb cane, mother-in-law's tongue, tuftroot) • Dierama (African harebell, angel's fishing rod, wand flower) • Diervilla (bush honeysuckle) • Dietes • Digitalis (foxglove) • Dillenia • Dillwynia • Dimorphotheca (African daisy) • Dionaea (Venus flytrap) • Dionysia • Dioon • Dioscorea syns. Rajania, Tamus, Testudinaria(yam) • Diospyros (ebony, persimmon) • Dipcadi • Dipelta • Diphylleia • Diplarrhena (butterfly flag) • Diplazium • Diplocyclos • Diploglottis • Diplolaena • Dipsacus (teasel) • Dipteris • Dipteronia • Dipteryx • Dirca (leatherwood) • Disa (an orchid genus) • Disanthus • Discaria • Dischidia • Discocactus • Disocactus • Disporopsis • Disporum (fairy-bells) • Dissotis • Distictis • Distylium • Dizygotheca • Docynia • Dodecatheon (shooting stars, American cowslip), now Primula sect. Dodecatheon • Dodonaea (hop bush) • Dolichandrone • Dombeya • Doodia (hacksaw fern, rasp fern) • Doronicum (leopard's bane) • Dorotheanthus (ice plant, Livingstone daisy) • Dorstenia • Doryanthes (spear lily) • Doryopteris • Dovyalis • Draba (whitlow grass) • Dracaena • Dracocephalum • Dracophyllum • Dracula (an orchid genus) • Dracunculus • Drimys • Drosanthemum • Drosera (sundew) • Dryandra • Dryas (mountain avens) • Drynaria • Dryopteris (buckler fern, shield fern, wood fern) • Duboisia • Duchesnea (Indian strawberry, mock strawberry) • Dudleya • Duranta • Duvalia • Dyckia • Dymondia • Dypsis syn. Chrysalidocarpus, Neodypsis == E ==

• Ebracteola • Ecballium • Eccremocarpus • Echeveria • Echidnopsis • Echinacea (coneflower) • Echinocactus • Echinocereus • Echinops (globe thistle) • Echinopsis • Echium • Edgeworthia • Edithcolea • Edraianthus • Egeria • Ehretia • Eichhornia (water hyacinth) • Elaeagnus • Elaeis (oil palm) • Elaeocarpus • Elatostema • Eleocharis (spike rush) • Elettaria • Eleutherococcus • Elodea (pondweed) • Elsholtzia • Elymus (wild rye) • Embothrium • Emilia (tasselflower) • Emmenopterys • Encelia • Encephalartos (Kaffir bread) • Encyclia (an orchid genus) • Enkianthus • Ensete • Eomecon (snow poppy) • Epacris • Ephedra (ephedra) • Epidendrum (an orchid genus) • Epigaea • Epilobium • Epimedium (barrenwort) • Epipactis (helleborine, an orchid genus) • Epiphyllum (orchid cactus) • Episcia (flame violet) • Epithelantha • Equisetum (horsetail) • Eragrostis (love grass) • Eranthemum • Eranthis (winter aconite) • Ercilla • Eremophila (emu bush) • Eremurus • Erica (heath/heather) • Erigeron (fleabane) • Erinacea • Erinus • Eriobotrya • Eriogonum • Eriophorum (cotton grass) • Eriophyllum • Eriostemon (waxflower) • Eritrichium • Erodium • Eryngium (eryngo, sea holly) • Erysimum (wallflower) • Erythrina (coral tree) • Erythronium • Escallonia • Eschscholzia (California poppy) • Escobaria • Espostoa • Etlingera • Eucalyptus (gum tree, ironbark) • Eucharis • Eucomis • Eucommia • Eucryphia • Eulophia (an orchid genus) • Euonymus • Eupatorium • Euphorbia (spurge) • Euptelea • Eurya • Euryale ferox • Euryops • Eustoma • Evolvulus • Exacum • Exochorda == F ==

• Fabiana • Fagus (beech) • Fallopia • Farfugium • Fargesia • Fascicularia • × Fatshedera (hybrid genus) • Fatsia • Faucaria • Felicia (blue daisy) • Fendlera • Fenestraria • Ferocactus • Ferraria • Ferula (giant fennel) • Festuca (fescue) • Fibigia • Ficus (fig) • Ficus pumila • Filipendula • Firmiana • Fittonia • Fitzroya • Fockea • Foeniculum (fennel) • Fontanesia • Forsythia • Fortunella (kumquat) • Fothergilla • Fouquieria • Fragaria (strawberry) • Frailea • Francoa • Frangipani • Franklinia • Fraxinus (ash) • Freesia • Fremontodendron • Fritillaria (fritillary) • Fuchsia • Furcraea . == G ==

• Gagea • Gaillardia • Galanthus (snowdrop) • Galax • Galega • Galium (bedstraw) • Galtonia • Gardenia • Garrya • Gasteria • Gaultheria • Gaura • Gaylussacia (huckleberry) • Gazania • Geissorhiza • Gelsemium • Genista • Gentiana (gentian) • Gentianopsis • Geranium (cranesbill, not same as Pelargonium) • Gerbera • Gesneria • Geum (avens) • Gevuina • Gibbaeum • Gilia • Gillenia • Ginkgo • Gladiolus • Glaucidium • Glaucium • Gleditsia (honey locust) • Globba • Globularia (globe daisy) • Gloriosa • Glottiphyllum • Gloxinia • Glyceria • Glycyrrhiza • Gomphocarpus • Gomphrena • Goniolimon • Goodyera (jewel orchid) • Gordonia • Graptopetalum • Graptophyllum • Graptoveria (hybrid genus) • Grevillea • Grewia • Greyia • Grindelia • Griselinia • Gunnera (dinosaur food) • Guzmania • Gymnocalycium • Gymnocarpium • Gymnocladus • Gynandriris • Gynura • Gypsophila == H ==

• Haageocereus • Haastia • Habenaria (an orchid genus) • Haberlea • Habranthus • Haemanthus (blood lily) • Hakea • Hakonechloa • Halesia (silverbell) • Halimiocistus (hybrid genus) • Halimium • Halimodendron • Hamamelis (witch-hazel) • Haplopappus • Hardenbergia (coral pea) • Harrisia • Hatiora • Haworthia • Hebe • Hechtia • Hedera (ivy) • Hedychium • Hedyotis (bluets) • Hedysarum • Hedyscepe (umbrella palm) • Helenium (sneezeweed) • Helianthemum (rock rose) • Helianthus (sunflower) • Helichrysum • Heliconia • Helictotrichon • Heliocereus • Heliophila • Heliopsis (ox eye) • Heliotropium (heliotrope) • Helleborus (hellebore) • Heloniopsis • Hemerocallis (daylily) • Hemigraphis • Hepatica • Heptacodium • Heracleum • Herbertia • Hereroa • Hermannia • Hermodactylus • Hesperaloe • Hesperantha • Hesperis • Hesperocallis • Heterocentron • Heterotheca • Heuchera (coral flower) • × Heucherella (hybrid genus) • Hibbertia • Hibiscus (rose of Sharon) • Hieracium (hawkweed) • Himalayacalamus • Hippeastrum (amaryllis) • Hippocrepis • Hippophae • Hohenbergia • Hohenbergiopsis • Hoheria • Holboellia • Holcus • Holmskioldia • Holodiscus • Homalocladium (ribbon bush) • Homeria • Hoodia • Hordeum (barley) • Horminum • Hosta (plantain lily) • Hottonia • Houttuynia • Hovea • Hovenia • Howea (sentry palm) • Hoya (wax flower) • Huernia • Humulus (hops) • Hunnemannia • Huntleya an orchid genus • Hyacinthella • Hyacinthoides • Hyacinthus (hyacinth) • Hydrangea • Hydrastis (goldenseal) • Hydrocharis (frogbit) • Hydrocleys • Hydrocotyle (pennywort) • Hygrophila • Hylocereus • Hylomecon • Hymenocallis • Hymenosporum • Hyophorbe (bottle palm) • Hyoscyamus (henbane) • Hypericum (St. John's wort, rose of Sharon) • Hyphaene (doum palm) • Hypocalymma • Hypoestes • Hypoxis (starflower) • Hypsela • Hyssopus (hyssop) I • Iberis (candytuft) • Ibervillea • Idesia • Ilex (holly) • Illicium • Impatiens (balsam) • Imperata • Incarvillea • Indigofera • Inula • Iochroma • Ipheion • Ipomoea (morning glory) • Ipomopsis • Iresine • Iris • Isatis • Isoplexis • Isopyrum • Itea • Ixia (corn lily) • Ixiolirion • Ixora == J ==

• Jaborosa • Jacaranda • Jacquemontia • Jamesia • Jasione • Jasminum (jasmine, jessamine) • Jatropha • Jeffersonia • Jovellana • Jovibarba • Juanulloa • Jubaea (Chilean wine palm) • Juglans (walnut) • Juncus (rush) • Juniperus (juniper) • Justicia == K ==

• Kadsura • Kaempferia • Kalanchoe • Kalimeris • Kalmia (mountain laurel) • Kalmiopsis • Kalopanax • Kelseya • Kerria • Kigelia (sausage tree) • Kirengeshoma • Kitaibela • Kleinia • Knautia • Knightia • Kniphofia • Koeleria (junegrass) • Koelreuteria (golden rain tree) • Kohleria • Kolkwitzia (beautybush) • Kosteletzkya • Kunzea == L ==

• Lablab • Laburnocytisus • Laburnum (laburnum) • Laccospadix • Lachenalia (Cape cowslip) • Laelia (an orchid genus) • × Laeliocattleya (hybrid orchid genus) • Lagarosiphon • Lagenophora • Lagerstroemia • Lagunaria • Lagurus • Lamarckia • Lambertia • Lamium (deadnettle) • Lampranthus • Lantana (shrub verbena) • Lapageria • Lardizabala • Larix (larch) • Larrea (creosote bush) • Latania (Latan palm) • Lathraea • Lathyrus • Laurelia • Laurus • Lavandula (lavender) • Lavatera (mallow) • Lawsonia • Layia • Ledebouria • Ledodendron (hybrid genus) • Ledum • Leea • Legousia • Leiophyllum • Leipoldtia • Leitneria • Lemboglossum • Lenophyllum • Leonotis • Leontice • Leontopodium (edelweiss) • Lepidozamia • Leptinella • Lechenaultia • Lespedeza (bush clover) • Leucadendron • Leucanthemella • Leucanthemopsis • Leucanthemum • Leuchtenbergia • Leucocoryne • Leucogenes • Leucojum (snowflake) • Leucophyllum • Leucophyta • Leucopogon • Leucoraoulia (hybrid genus) • Leucospermum (pincushion) • Leucothoe • Lewisia • Leycesteria • Leymus • Liatris • Libertia • Libocedrus • Ligularia • Ligustrum (privet) • Lilium (lily) • Limnanthes • Limnocharis • Limonium (sea lavender) • Linanthus • Linaria (toadflax) • Lindelofia • Lindera • Lindheimera (star daisy) • Linnaea (twinflower) • Linospadix • Linum (flax) • Liquidambar (sweetgum) • Liriodendron (tulip tree) • Liriope (lilyturf) • Lithocarpus • Lithodora • Lithophragma • Lithops • Littonia • Livistona • Loasa • Lobelia • Lobularia (sweet alyssum) • Lodoicea (coco de mer) • Loiseleuria • Lomandra (mat rush) • Lomatia • Lomatium • Lomatophyllum • Lonicera (honeysuckle) • Lopezia • Lophomyrtus • Lophospermum • Lophostemon • Loropetalum • Lotus • Luculia • Ludwigia • Luma • Lunaria • Lupinus (lupin) • Luzula (woodrush) • Lycaste (an orchid genus) • Lychnis (campion) • Lycium • Lycopodium (club moss) • Lycoris • Lygodium (climbing fern) • Lyonia • Lyonothamnus • Lysichiton (yellow skunk cabbage) • Lysiloma • Lysimachia • Lythrum (loosestrife) == M ==

• Maackia • Macfadyena • Machaeranthera • Mackaya • Macleania • Macleaya • Maclura • Macropidia • Macrozamia • Magnolia • Mahonia • Maianthemum (May lily) • Maihuenia • Malcolmia • Malephora • Malope • Malpighia • Malus (apple, crabapple) • Malva (mallow) • Malvastrum • Malvaviscus • Mammillaria • Mandevilla • Mandragora (mandrake) • Manettia • Manglietia • Maranta • Margyricarpus • Marrubium (horehound) • Marsilea (pepperwort) • Masdevallia (an orchid genus) • Matteuccia • Matthiola (stock) • Maurandella • Maurandya • Maxillaria (an orchid genus) • Maytenus • Mazus • Meconopsis • Medicago (alfalfa) • Medinilla • Meehania • Megacodon • Megaskepasma • Melaleuca (paperbark) • Melasphaerula • Melastoma • Melia • Melianthus • Melica (melic) • Melicytus • Melinis • Meliosma • Melissa (balm) • Melittis (bastard balm) • Melocactus • Menispermum (moonseed) • Mentha (mint) • Mentzelia (starflower) • Menyanthes • Menziesia • Merendera • Merremia • Mertensia • Mespilus • Metasequoia (dawn redwood) • Metrosideros • Meum • Mexicoa • Michauxia • Michelia • Microbiota • Microcachrys • Microlepia • Micromeria • Mikania • Milium • Milla • Millettia • Miltonia (an orchid genus) • Miltoniopsis (pansy orchid) • Mimetes • Mimosa (mimosa, or sensitive plant) • Mimulus (monkey flower) • Mirabilis • Miscanthus • Mitchella (partridge berry) • Mitella • Mitraria • Molinia • Moltkia • Moluccella • Monadenium • Monanthes • Monarda (bee balm) • Monardella • Monstera • Moraea • Morina • Morisia • Morus (mulberry) • Mucuna • Muehlenbeckia • Mukdenia • Musa (banana, plantain) • Muscari (grape hyacinth) • Mussaenda • Mutisia • Myoporum • Myosotidium • Myosotis (forget-me-not) • Myrica • Myriophyllum (milfoil) • Myrrhis (sweet cicely) • Myrsine • Myrteola • Myrtillocactus • Myrtus (myrtle) == N ==

• Nandina (heavenly bamboo) • Narcissus (daffodil) • Nasturtium (watercress) • Nautilocalyx • Nectaroscordum • Neillia • Nelumbo (lotus) • Nematanthus • Nemesia • Nemopanthus (mountain holly) • Nemophila • Neobuxbaumia • Neolitsea • Neolloydia • Neomarica • Neoporteria • Neoregelia • Nepenthes (pitcher plant) • Nepeta (catmint) • Nephrolepis • Nerine • Nerium (oleander) • Nertera • Nicandra • Nicotiana (tobacco) • Nidularium • Nierembergia • Nigella • Nipponanthemum • Nolana • Nomocharis • Nopalxochia • Nothofagus (southern beech) • Notholirion • Nothoscordum (false garlic) • Notospartium • Nuphar (spatterdock) • Nymania • Nymphaea (waterlily) • Nymphoides (floating heart) • Nyssa (tupelo) == O ==

• Obregonia • Ochagavia • Ochna • Ocimum • × Odontioda (hybrid orchid genus) • × Odontocidium (hybrid orchid genus) • Odontoglossum (an orchid genus) • Odontonema • × Odontonia (hybrid orchid genus) • Oemleria • Oenanthe (water dropwort) • Oenothera (evening primrose, sundrops) • Olea (olive) • Olearia (daisy bush) • Olneya • Olsynium • Omphalodes (navelwort) • Omphalogramma • Oncidium (an orchid genus) • Onoclea • Ononis (restharrow) • Onopordum • Onosma • Oophytum • Ophiopogon (lilyturf) • Ophrys (an orchid genus) • Oplismenus • Opuntia (prickly pears, chollas and many other cactus species) • Orbea • Orbeopsis • Orchis (an orchid genus) • Oreocereus • Origanum (marjoram, oregano) • Orixa • Ornithogalum • Orontium (golden club) • Orostachys • Oroya • Ortegocactus • Orthophytum • Orthrosanthus • Orychophragmus • Oryza (rice) • Osbeckia • Osmanthus • Osmunda (royal fern) • Osteomeles • Osteospermum • Ostrowskia (giant bellflower) • Ostrya • Othonna • Ourisia • Oxalis (shamrock, sorrel) • Oxydendrum • Oxypetalum • Ozothamnus == P ==

• Pachistima • Pachycereus • Pachycormus • Pachycymbium • Pachyphragma • Pachyphytum • Pachypodium • Pachysandra • Pachystachys • Pachystegia • Pachystima • Pachyveria (hybrid genus) • Paeonia (peony) • Paliurus • Pamianthe • Panax (ginseng) • Pancratium (sea lily) • Pandanus (screw pine) • Pandorea • Panicum • Pansy • Papaver (poppy) • Paphiopedilum (slipper orchid) • Paradisea (paradise lily) • Parahebe • Paraquilegia • Parkinsonia • Parnassia • Parochetus • Parodia • Paronychia • Parrotia • Parrotiopsis • Parthenocissus • Passiflora (granadilla, passionflower) • Patersonia • Patrinia • Paulownia • Paurotis • Pavonia • Pedilanthus • Pediocactus • Pelargonium (geranium) • Pellaea • Peltandra (arrow arum) • Peltoboykinia • Peltophorum • Peniocereus • Pennisetum • Penstemon • Pentachondra • Pentaglottis • Pentas • Peperomia • Peraphyllum • Pereskia • Perezia • Pericallis • Perilla • Periploca • Perovskia (now included in Salvia) • Pernettya (now included in Gaultheria) • Persea • Persicaria (fleeceflower, knotweed) • Petasites (butterbur, sweet coltsfoot) • Petrea • Petrocosmea • Petrophile • Petrophytum • Petrorhagia • Petroselinum (parsley) • Petteria • Petunia • Phacelia • Phaedranassa (queen lily) • Phaius (an orchid genus) • Phalaenopsis (moth orchid) • Phalaris • Phebalium • Phegopteris (beech fern) • Phellodendron (cork tree) • Philadelphus (mock orange) • Philageria (hybrid genus) • Philesia • Phillyrea • Philodendron • Phlebodium • Phlomis • Phlox • Phoenix (date palm) • Phormium • Photinia • Phragmipedium (an orchid genus) • Phragmites (reed) • Phuopsis • Phygelius • Phylica (Cape myrtle) • × Phylliopsis (hybrid genus) • Phyllocladus (toatoa) • Phyllodoce • Phyllostachys • Phyllothamnus (hybrid genus) • Physalis (ground cherry) • Physaria (bladderpod) • Physocarpus • Physoplexis • Physostegia • Phyteuma • Phytolacca (pokeweed) • Picea (spruce) • Picrasma • Pieris • Pilea • Pileostegia • Pilosella • Pilosocereus • Pimelea • Pimpinella • Pinanga • Pinckneya • Pinellia • Pinguicula (butterwort) • Pinus (pine) • Piper (pepper) • Piptanthus • Pisonia • Pistacia (pistachio) • Pistia • Pitcairnia • Pithecellobium • Pittosporum • Pityrogramma • Plantago (plantain) • Platanus (plane tree, sycamore) • Platycarya • Platycerium (staghorn fern) • Platycladus (Chinese arborvitae) • Platycodon (balloon flower) • Platystemon (creamcups) • Plectranthus an orchid genus • Pleioblastus • Pleione (an orchid genus) • Pleiospilos (living granite) • Pleurothallis (an orchid genus) • Plumeria (frangipani) • Poa • Podalyria • Podocarpus • Podophyllum (mayapple) • Podranea • Polemonium (jacob's ladder, abscess root) • Polianthes • Poliothyrsis • Polygala (milkwort, seneca, snakeroot) • Polygonatum • Polygonum (knotweed, knotgrass) • Polypodium • Polyscias • Polystichum • Poncirus • Pongamia • Pontederia (pickerel weed) • Populus (aspen, poplar, cottonwood) • Porana • Portea • Portulaca (purslane, moss rose) • Portulacaria • Posoqueria • Potamogeton • Potentilla (cinquefoil) • Pothos • × Potinara (hybrid orchid genus) • Pratia • Primula (primrose) • Prinsepia • Pritchardia • Proboscidea (unicorn plant) • Promenaea an orchid genus • Prosopis (mesquite) • Prostanthera (mint bush) • Protea • Prumnopitys • Prunella (self-heal) • Prunus (almond, apricot, cherry, peach, plum) • Pseuderanthemum • Pseudocydonia • Pseudolarix (golden-larch) • Pseudopanax • Pseudosasa • Pseudotsuga (douglas-fir) • Pseudowintera • Psilotum • Psychopsis (butterfly orchid) • Psylliostachys (statice) • Ptelea • Pteris (brake, table fern) • Pterocactus • Pterocarya (wingnut) • Pteroceltis • Pterocephalus • Pterodiscus • Pterostyrax • Ptilotus • Ptychosperma • Pueraria • Pulmonaria (lungwort) • Pulsatilla • Pultenaea • Punica (pomegranate) • Purshia • Puschkinia • Putoria • Puya • Pycnanthemum • Pycnostachys • Pyracantha (firethorn) • Pyrola (wintergreen) • Pyrostegia • Pyrrosia • Pyrus (pear) == Q ==

• Quamoclit • Quaqua • Quercus (oak) • Quesnelia • Quisqualis • Quince == R ==

• Ramonda • Ranunculus (buttercup, crowfoot) • Ranzania • Raoulia • Raphia (raffia) • Ratibida • Ravenala (traveler's tree) • Rebutia • Rehderodendron • Rehmannia • Reineckea • Reinwardtia • Reseda (Mignonette) • Retama • Rhamnus • Rhaphidophora • Rhaphiolepis • Rhapidophyllum (needle palm) • Rhapis (lady palm) • Rheum (rhubarb) • Rhexia • Rhipsalis • Rhodanthe (strawflower) • Rhodanthemum • Rhodiola • Rhodochiton • Rhododendron • Rhodohypoxis • Rhodophiala • Rhodothamnus • Rhodotypos • Rhoeo • Rhoicissus • Rhombophyllum • Rhus (sumac) • Rhynchelytrum • Rhynchostylis (an orchid genus) • Ribes (currant) • Richea • Ricinus (castor-oil plant) • Rigidella • Robinia • Rodgersia • Rodriguezia an orchid genus • Rohdea • Romanzoffia • Romneya (Matilija poppy, tree poppy) • Romulea • Rondeletia • Rosa (rose) • Roscoea • Rosmarinus (rosemary) • Rossioglossum an orchid genus • Rothmannia • Roystonea (royal palm) • Rubus (raspberry) • Rudbeckia (coneflower) • Ruellia • Rumex (dock) • Rumohra • Rupicapnos • Ruschia • Ruscus • Russelia • Ruta (rue) == S ==

• Sabal (palmetto) • Saccharum (plume grass, sugar cane) • Sadleria • Sagina (pearlwort) • Sagittaria (arrowhead) • Salix (willow) • Salpiglossis • Salvia (sage) • Salvinia • Sambucus (elder) • Sanchezia • Sandersonia • Sanguinaria (bloodroot) • Sanguisorba (burnet) • Sanicula • Sansevieria • Santolina • Sanvitalia (creeping zinnia) • Sapindus • Sapium (tallow tree) • Saponaria (soapwort) • Sarcocapnos • Sarcocaulon • Sarcococca • Saritaea, see Bignonia magnifica • Sarmienta • Sarracenia (pitcher plant) • Sasa • Sassafras • Satureja (savory) • Sauromatum • Saxegothaea • Saxifraga (saxifrage) • Scabiosa (scabious plant) • Scadoxus (blood lily) • Scaevola • Schefflera • Schima • Schinus • Schisandra • Schizachyrium • Schizanthus • Schizopetalon • Schizophragma • Schizostylis • Schlumbergera • Schoenoplectus • Schomburgkia an orchid genus • Schotia • Schwantesia • Sciadopitys • Scilla (including the former genus Chionodoxa) • Scindapsus • Scirpoides • Sclerocactus • Scoliopus • Scopolia • Scrophularia (figwort) • Scutellaria • Securinega • Sedum (stonecrop) • Selaginella • Selago • Selenicereus • Selinum • Semele • Semiaquilegia • Semiarundinaria • Sempervivum (hens and chicks) • Senecio (ragwort) • Senna • Sequoia (coast redwood) • Sequoiadendron (giant sequoia) • Seriphidium • Serissa • Serruria • Sesbania • Sesleria • Setaria • Shepherdia • Shibataea • Shortia • Sibiraea • Sidalcea • Sideritis • Silene (campion) • Silphium • Silybum • Simmondsia (jojoba) • Sinningia • Sinofranchetia • Sinojackia • Sinowilsonia • Sisyrinchium • Skimmia • Smilacina • Smilax • Smithiantha • Smyrnium • Sobralia an orchid genus • Solandra • Solanum (potato, nightshade) • Soldanella (snowbell) • Soleirolia • Solenopsis • Solenostemon • Solidago (goldenrod) • Solidaster (supposedly hybrid genus; see Solidago) • Sollya • Sonerila • Sophora • × Sophrolaeliocattleya (trigeneric hybrid orchid) • Sophronitis (an orchid genus) • Sorbaria • Sorbus (rowan, whitebeam) • Sorghastrum • Sparaxis • Sparganium (bur-reed) • Sparrmannia • Spartina (cord grass) • Spartium (broom) • Spathiphyllum • Spathodea • Sphaeralcea • Spigelia • Spiraea (spirea) • Sprianthes (an orchid genus) • Sporobolus • Sprekelia • Stachys (betony) • Stachyurus • Stangeria • Stanhopea (an orchid genus) • Stapelia • Stapelianthus • Staphylea (bladdernut) • Stauntonia • Stenanthium • Stenocactus • Stenocarpus • Stenocereus • Stenomesson • Stenotaphrum • Stenotus • Stephanandra • Stephanocereus • Stephanotis • Sternbergia • Stigmaphyllon • Stipa • Stokesia • Stomatium • Stratiotes • Strelitzia (bird of paradise) • Streptocarpus (Cape primrose) • Streptosolen • Strobilanthes • Stromanthe • Strombocactus • Strongylodon • Stuartia • Stylidium • Stylophorum • Styphelia • Styrax • Succisa • Sulcorebutia • Sutera • Sutherlandia • Swainsona • Swainsonia • Syagrus • Sycoparrotia (hybrid genus) • Sycopsis • Symphoricarpos (snowberry) • Symphyandra • Symphytum (comfrey) • Symplocos • Synadenium • Syneilesis • Syngonium • Synthyris • Syringa (lilac) • Syzygium (rose apple) == T ==

• Tabebuia • Tabernaemontana • Tacca • Tagetes (Mexican or French marigold) • Talinum (fameflower) • Tamarix (tamarisk) • Tanacetum (tansy) • Tanakaea • Tapeinochilos • Taxodium (bald cypress) • Taxus (yew) • Tecoma • Tecomanthe • Tecomaria • Tecophilaea • Telekia • Telephium • Tellima • Telopea (waratah) • Templetonia • Terminalia • Ternstroemia • Tetracentron • Tetradium (bee tree) • Tetranema • Tetraneuris • Tetrapanax • Tetrastigma • Tetratheca • Teucrium • Thalia • Thalictrum • Thelesperma • Thelocactus • Thelypteris • Thermopsis • Thespesia • Thevetia • Thlaspi • Thrinax (thatch palm) • Thryptomene (heath myrtle) • Thuja (thuja, arborvitae) • Thujopsis (hiba) • Thunbergia • Thymophylla • Thymus (thyme) • Tiarella • Tibouchina • Tigridia • Tilia (linden) • Tillandsia (air plant, Spanish moss) • Tipuana • Titanopsis • Tithonia (Mexican sunflower) • Todea • Tolmiea • Tolpis • Toona • Torenia • Torreya (nutmeg yew) • Tovara • Townsendia • Trachelium • Trachelium caeruleum (blue throatwort) • Trachelospermum • Trachycarpus (chusan palm) • Trachymene • Tradescantia (spiderwort) • Trapa (water caltrop) • Trichodiadema • Trichosanthes • Tricyrtis (toad lily) • Trientalis • Trifolium (clover) • Trillium • Tripetaleia • Tripterygium • Triteleia (triplet lily) • Tritonia • Trochodendron • Trollius (globeflower) • Tropaeolum (nasturtium) • Tsuga (hemlock) • Tsusiophyllum • Tuberaria • Tulbaghia • Tulipa (tulip) • Tweedia • Tylecodon • Typha (cattail) == U ==

• Uebelmannia • Ugni • Ulex (gorse) • Ulmus (elm) • Umbellularia • Uncinia • Uniola • Urceolina • Urginea • Ursinia • Utricularia (bladderwort) • Uvularia (merrybells, bellwort) == V ==