Extirpated vascular plants •
Collinsia verna — spring blue-eyed mary •
Desmodium illinoense — Illinois tick-trefoil
Endangered vascular plants •
Abronia umbellata — pink sand-verbena •
Actaea elata — tall bugbane •
Adiantum capillus-veneris — southern maidenhair fern •
Agalinis aspera — rough agalinis •
Agalinis gattingeri — Gattinger's agalinis •
Agalinis skinneriana — Skinner's agalinis •
Ammannia robusta — scarlet ammannia •
Antennaria flagellaris — stoloniferous pussytoes •
Aristida basiramea — forked three-awned grass •
balsamorhiza deltoidea — deltoid balsamroot •
Betula lenta — cherry birch •
Braya longii — Long's braya •
Buchnera americana — bluehearts •
Camissonia contorta — contorted-pod evening-primrose •
Carex lupuliformis — false hop sedge •
Carex juniperorum — juniper sedge •
Castanea dentata — American chestnut •
Castilleja levisecta — golden paintbrush •
Chimaphila maculata — spotted wintergreen •
Cirsium pitcheri — Pitcher's thistle •
Collomia tenella — slender collomia •
Coreopsis rosea — pink coreopsis •
Cryptantha minima — tiny cryptanthe •
Cypripedium candidum — small white lady's-slipper •
Drosera filiformis — thread-leaved sundew •
Eleocharis equisetoides — horsetail spike-rush •
Epilobium densiflorum — dense spike-primrose •
Epilobium torreyi — brook spike-primrose •
Frasera caroliniensis — American columbo •
Gentiana alba — white prairie gentian •
Geum peckii — eastern mountain avens •
Isoetes engelmannii — Engelmann's quillwort •
Isotria medeoloides — small whorled pogonia •
Isotria verticillata — large whorled pogonia •
Juglans cinerea — butternut •
Juncus kelloggii — Kellogg's rush •
Lespedeza virginica — slender bush-clover •
Liparis liliifolia — purple twayblade •
Lipocarpha micrantha — small-flowered lipocarpha •
Lotus formosissimus — seaside bird's-foot lotus •
Lotus pinnatus — bog bird's-foot trefoil •
Lupinus densiflorus — dense-flowered lupine •
Lupinus lepidus var. lepidus — prairie lupine •
Lupinus rivularis — streambank lupine •
Magnolia acuminata — cucumber tree •
Meconella oregana — white meconella •
Microseris bigelovii — coast microseris •
Minuartia pusilla — dwarf sandwort •
Morus rubra — red mulberry •
Opuntia humifusa — eastern prickly pear cactus •
Orthocarpus barbatus — Grand Coulee owl-clover •
Orthocarpus bracteosus — rosy owl-clover •
Panax quinquefolius — American ginseng •
Pedicularis furbishiae — Furbish's lousewort •
Phacelia ramosissima — branched phacelia •
Physematium obtusum — blunt-lobed woodsia •
Plantago cordata — heart-leaved plantain •
Platanthera leucophaea — eastern prairie fringed-orchid •
Platanthera praeclara — western prairie fringed-orchid •
Polygala incarnata — pink milkwort •
Psilocarphus brevissimus (southern mountain population) — dwarf woolly-heads •
Psilocarphus elatior — tall woolly-heads •
Pycnanthemum incanum — hoary mountain-mint •
Ranunculus alismifolius var. alismifolius — water-plantain buttercup •
Rotala ramosior — toothcup •
Salix jejuna — barrens willow •
Sanicula arctopoides — bear's-foot sanicle •
Silene scouleri grandis — coastal Scouler's catchfly •
Silene spaldingii — Spalding's campion •
Solidago speciosa — showy goldenrod •
Stylophorum diphyllum — wood-poppy •
Symphyotrichum frondosum — short-rayed alkali aster •
Tephrosia virginiana — Virginia goat's-rue •
Tonella tenella — small-flowered tonella •
Trichophorum planifolium — bashful bulrush •
Trillium flexipes — drooping trillium •
Triphora trianthophora — nodding pogonia •
Triphysaria versicolor versicolor — bearded owl-clover •
Tripterocalyx micranthus — small-flowered sand-verbena •
Triteleia howellii — Howell's triteleia •
Viola pedata — bird's-foot violet
Threatened vascular plants •
Aletris farinosa — colicroot •
Azolla mexicana — Mexican mosquito-fern •
Bartonia paniculata paniculata — branched bartonia •
Braya fernaldii — Fernald's braya •
Buchloe dactyloides — buffalograss •
Calochortus lyallii — Lyall's mariposa lily •
Camassia scilloides — wild hyacinth •
Carex sabulosa — Baikal sedge •
Castilleja rupicola — cliff paintbrush •
Celtis tenuifolia — dwarf hackberry •
Cephalanthera austiniae — phantom orchid •
Chenopodium subglabrum — smooth goosefoot •
Cirsium hillii — Hill's thistle •
Corydalis scouleri — Scouler's corydalis •
Dalea villosa var. villosa — hairy prairie-clover •
Eleocharis tuberculosa — tubercled spike-rush •
Enemion biternatum — false rue-anemone •
Eurybia divaricata — white wood aster •
Gentianopsis virgata subsp. victorinii — Victorin's gentian •
Gymnocladus dioicus — Kentucky coffee-tree •
Halimolobos virgata — slender mouse-ear-cress •
Hydrastis canadensis — goldenseal •
Hydrocotyle umbellata — water-pennywort •
Hymenoxys herbacea — lakeside daisy •
Iris lacustris — dwarf lake iris •
Iris missouriensis — western blue flag •
Isoetes bolanderi — Bolander's quillwort •
Justicia americana — American water-willow •
Lachnanthes caroliana — redroot •
Liatris spicata — dense blazing star •
Limnanthes macounii — Macoun's meadowfoam •
Lophiola aurea — golden crest •
Phlox speciosa subsp. occidentalis — showy phlox •
Polemonium vanbruntiae — van Brunt's Jacob's-ladder •
Polystichum lemmonii — Lemmon's holly fern •
Polystichum scopulinum — mountain holly fern •
Ptelea trifoliata — common hoptree •
Sabatia kennedyana — Plymouth gentian •
Salix chlorolepis — green-scaled willow •
Sanicula bipinnatifida — purple sanicle •
Sericocarpus rigidus — white-top aster •
Smilax rotundifolia (Great Lakes plains population) — round-leaved greenbrier •
Symphyotrichum anticostense — Anticosti aster •
Symphyotrichum laurentianum — Gulf of St. Lawrence aster •
Symphyotrichum praealtum — willowleaf aster •
Symphyotrichum prenanthoides — crooked-stem aster •
Symphyotrichum sericeum — western silvery aster •
Tradescantia occidentalis — western spiderwort •
Vaccinium stamineum — deerberry •
Viola praemorsa subsp. praemorsa — yellow montane violet,
praemorsa subspecies •
Yucca glauca — soapweed
Vascular plants of special concern •
Achillea millefolium var. megacephalum — large-headed woolly yarrow •
Armeria maritima subsp. interior — Athabasca thrift •
Arnoglossum plantagineum — tuberous Indian-plantain •
Asplenium scolopendrium var. americanum — American hart's-tongue fern •
Astragalus robbinsii var. fernaldii — Fernald's milk-vetch •
Bidens amplissima — Vancouver Island beggarticks •
Cicuta maculata var. victorinii — Victorin's water-hemlock •
Clethra alnifolia — sweet pepperbush •
Deschampsia mackenzieana — Mackenzie hairgrass •
Dryopteris arguta — coastal wood fern •
Fraxinus quadrangulata — blue ash •
Hibiscus moscheutos — swamp rose-mallow •
Isoetes prototypus — prototype quillwort •
Juncus caesariensis — New Jersey rush •
Lilaeopsis chinensis — eastern lilaeopsis •
Potamogeton hillii — Hill's pondweed •
Psilocarphus brevissimus (prairie population) — dwarf woolly-heads •
Psilocarphus elatior (prairie population) — tall woolly-heads •
Rosa setigera — climbing prairie rose •
Salix brachycarpa var. psammophila — sand dune short-capsuled willow •
Salix silicicola — felt-leaf willow •
Salix turnorii — Turnor's willow •
Solidago houghtonii — Houghton's goldenrod •
Solidago riddellii — Riddell's goldenrod •
Tanacetum huronense var. floccosum — floccose tansy ==Mosses==