Enquiry into Plants classifies plants according to how they
reproduce, their localities, their sizes, and their practical uses including as foods, juices, and herbs. The books describe the natural history of plants as follows:
Book 1: Plant anatomy Theophrastus tours
plant anatomy, including leaves (
phylla), flowers, catkins, fruits (
karpoi), seeds, roots (
rhizai), and wood. Plants are classified as
trees,
shrubs,
herbaceous perennials, and annual
herbs (
poai); these divisions are acknowledged to be rough and ready, as is the division into wild or cultivated, whereas the aquatic/terrestrial division appeared to be natural. Theophrastus notes that some plants are irregular, while the
silver fir has branches always opposite each other and other plants have branches equally spaced or in rows.
Figs have the longest roots, while the
banyan sends roots down from the shoots, forming a circle of roots at a distance all round the trunk.
Book 2: Tree and plant propagation spathe for artificial pollination, as described by Theophrastus Theophrastus writes that plants can
grow spontaneously, from
seed, or
from vegetative parts of the plant. Plants with bulbs grow from those. Soil and climate influence growth. Some plants change into others unless care is taken, so
bergamot turns into
mint, and
wheat turns into
darnel. He reports that if
celery is trodden after sowing, it will become curly, and that figs are the easiest trees to propagate, whereas date palms have to be grown from several seeds together, and they like
irrigation, dung, salt (at the age of one year) and being transplanted. Other kinds of palm have different habits and fruits. He notes that
gall insects come out of wild figs and make the cultivated figs swell, which helps to prevent premature shedding of the fruit. The male spathe of the
date palm is cut off and brought to the female, and
its dust is shaken over the female tree to make it fruit.
Book 3: Wild trees Theophrastus asserts that all wild trees grow from seed or from roots. He mentions that the
philosophers spoke of spontaneous generation, as when
Anaxagoras claims the air contains the seeds of every plant, whereas
Diogenes believed plants arose when water mixed with earth. In places like
Crete, Theophrastus writes that native plants spring up if the ground is simply disturbed, and that wild trees are generally more vigorous than cultivated ones, give fruit later, and like cold and hilly terrain. He asserts that trees which can grow both on hill and plain grow better and taller when grown on the plain. The book offers numerous examples of Theophrastus's note-like style, with lists of species interspersed among the general explanations. For example, "Now among wild trees those are evergreen which were mentioned before, silver-fir fir 'wild pine' box andrachne yew Phoenician cedar terebinth alaternus hybrid arbutus bay holm-oak holly cotoneaster kermes-oak tamarisk; but all the others shed their leaves ..."
Book 4: Trees and shrubs from abroad Theophrastus describes trees and shrubs from different places and habitats, as for instance a sheltered part of the Arcadia region near Krane in a deep valley where the sun never reaches, and the silver-fir trees are exceptionally tall. He looks into the plants of
Egypt,
Libya, Asia, northern regions, and then
aquatic plants from the Mediterranean,
wetlands especially in Egypt,
reeds and
rushes. He also considers factors that limit the life of plants including diseases and weather damage.
Book 5: Wood s, like these at ancient
Olympia, yielded wood suitable for shipbuilding, according to Theophrastus in Book 5. Theophrastus describes the wood of different trees, the effects of climate on wood, of knots and 'coiling' in timber and other differences in quality. He discusses which woods to use for specific purposes such as for
carpentry,
shipbuilding and for building houses, and the making of
charcoal. The most useful trees are said to be silver-fir and fir, and they have the best wood in the largest sizes; the silver-fir is softer than the fir, and its wood has layers like an onion, and is made entirely of these layers. The strongest and most attractive wood is smooth, without knots. In
Syria,
terebinth wood is dark and close-grained, Theophrastus reports, and used both for the handles of daggers and, turned on the lathe, for making cups. He claims that the hardest timber is of oak and
holm oak, while elm warps the least, so it is used for the pivots and sockets of doors, which must be straight. The wood of palms is light and soft like cork-oak, but is tougher and less brittle, so it is good for carving images. Timber from the cedar, ebony, box, olive, oak and sweet chestnut keeps well and resists decay. He asserts that
Tamarisk wood from Greece is weak, but from the Arabian island of Tylos it is as strong as kermes-oak. The wood of oak and the knotted parts of fir and silver-fir are described as the hardest to work. Ships are generally made of silver-fir, fir, and Syrian cedar; in Cyprus they use
Aleppo pine which is better than the fir that grows there. Theophrastus records that in the lowlands of Italy (the country of the Latins) they grow bay, myrtle and excellent beech trees long enough for the whole length of a ship.
Book 6: Undershrubs, with thorns or without Theophrastus classifies undershrubs as spiny, such as
thistle,
eryngo and
safflower, and spineless, such as
marjoram,
savory,
sage,
horehound, and
balm. He notes that some have a hollow stem, such as
deadly nightshade and
hemlock. Roses, he writes, vary in number of petals, roughness of bark, colour and scent; they have five, twelve, twenty or more petals, and those with the sweetest scent come from Cyrene, and are used for making perfume. The times of flowering of different species are listed.
Book 7: Pot-herbs Theophrastus reports that
cabbage,
radish and
turnip are sown in July after the
summer solstice, along with
beet,
lettuce,
mustard and
coriander.
Leeks, celery,
onion and
orache are sown in January.
Cucumber,
gourds,
basil,
purslane and savory, in contrast, he writes, are sown in April. Ripe seeds do not germinate at once but wait for the right time. He asserts that all the herbs can be grown from seed, while
rue, marjoram and basil can be raised from cuttings, and garlic, onion and other bulbs are grown from their roots. All the flowers of a herb appear at one time, except for basil which puts out a series of flowers starting low on the plant. Cumin has the most fruits, but it is said you have to curse and insult the plant to get a good crop. Theophrastus describes varieties of some herbs, for instance that the white lettuce is sweetest and tenderest, while there are many kinds of onion, with Sardian, Cnidian, Samothracian and Ascalonian varieties from those regions. Garlic is said to be planted close to the solstice; the Cyprian variety is largest and is used in salads. All herbs except rue are said to like dung. Of the wild herbs, Theophrastus reports that some such as
cat's ear are edible, whereas others like
dandelion are too bitter to be worth eating.
Book 8: Cereals and legumes Theophrastus groups together the
cereals and the legumes (peas and beans), and includes millet and other many-seeded plants like sesame also. These can only be grown from seed. They can be sown early, as with wheat, barley and beans, or in spring after the
equinox, for plants like
lentils, tares and peas.
Vetch and chickpeas can, he reports, be sown at either season. When sprouting, beans form a shape like a penis, from which the root grows down and the leafy stem upwards. Wheat and barley flower for four or five days, whereas the legumes flower for much longer. Theophrastus reports that these plants grow differently according to the region, so for instance crops in
Salamis appear earlier than those elsewhere in
Attica. Wheat varieties are recorded as being named for their localities; they differ in colour, size, growth habit and food value. In a place near Bactra in Asia the wheat grains are said to grow as big as the stone of an olive, whereas pulses do not in Theophrastus's view vary to the same extent.
Book 9: Medicinal uses of plants being collected by tapping a pine tree This book is one of the first
herbals, admittedly much simpler than those of
Nicander,
Dioscorides or
Galen. Theophrastus covers juices (
chylismos),
gums, and
resins, the uses of some hundreds of
plants as medicines, and how to gather them.
Resin is gathered by tapping trees including silver-fir and Aleppo pine; the best resin is from the terebinth. On
Mount Ida in Crete the people gather pitch from
Corsican pine and Aleppo pine. Gums such as
frankincense,
myrrh and
balsam of
Mecca are gathered either by cutting the plant or naturally. Frankincense and myrrh are gathered into the closely guarded temple of the
Sabaeans.
Cassia and
cinnamon also come from the
Arabian peninsula. Drug collectors have certain traditions which may be accurate or may be exaggerated. Precautions are rightly taken when gathering hellebore, and men cannot dig it up for long; whereas the story that the
peony must be dug up at night for fear that a
woodpecker will watch and cause the man a
rectal prolapse is a mere superstition. Similarly the idea that you must mark three circles around a mandrake plant with a sword, and speak of the mysteries of love while cutting it, is just far-fetched. Apart from Greece itself, medicinal plants are produced in Italy in
Tyrrhenia, as
Aeschylus records, and
Latium; and in Egypt, which as
Homer mentions is the source of the drug
nepenthes that makes men forget sorrow and passion. The best hemlock comes from Susa, while
dittany, useful in childbirth, comes only from Crete. Wolfsbane comes from Crete and
Zakynthos; it can be made into a poison that causes death a year or more after taking it, and there is no antidote. Hemlock is a poison which brings a painless death; pepper and frankincense are antidotes for it.
Strykhnos causes madness, but
oleander root in wine makes people gentle and cheerful. Birthwort has many uses including for bruises on the head, snakebite, and prolapse of the uterus. ==Reception==