292 A TEXT-BOOK OF BOTANY 
In so vast a family it will be impossible to enumerate all 
the forms that are well known on account of their common oc- 
currence or usefulness, but some of them may be mentioned. 
The sweet pea, wistaria, and lupine suggest the numerous 
herbaceous forms with showy flowers. In this family also 
Fic, 283.—A leguminous plant: 4, flowers and pods; B, petals separated to show 
standard (a), wings (b), and keel petals (c).—After WossIpLo. 
are found the numerous sensitive plants (§ 17) character- 
istic of southwestern arid regions (I’ig. 284). Among the 
trees the following may be mentioned: common locust, 
prized for both its showy flowers and its valuable timber; 
honey locust, beset with conspicuous thorns (Fig. 60); red- 
bud, with numerous pink flowers appearing upon the naked 
branches in early spring; and the singular coffee-tree. 
Among the useful forms, the so-called forage plants are 
important; that is, plants used for pasturage or hay, just as 
are the grasses. The most common of these is clover, a 
