94 
XXVI. LEGUMINOS.E. 
arts, in medicine, and domestic economy. Indigofera affords 
Indigo ; Glycyrrliiza , Liquorice ; Astragalus , Gum Tragacanth ; 
Soja, Soy; Mucuna , Cow-itch or Cow-age ; Erythrina , Gum-lac ; 
Pterocarpus, Gum-dragon , and Saunders-wood ; Brya , Jamaica 
Ebony ; Acacia, Gum-Arabic, and one kind of India-rubber; 
Dipterix, the Tonquin bean ; Hcematoxylon, Log-wood ; Cassia 
yields Senna, and other potent drugs ; Copaifera, Balsam of 
Copaiva ; Hymencea, Gum Anime. Their seeds yield food for 
man and various animals, their herbage for cattle. — All the 
British genera are papilionaceous, with the standard superior 
and a vexillary aestivation, and have 10 stamens, monadelphous 
or diadelphous (9 and 1, the solitary stamen being superior). 
I. Stamens monadelphous. Geniste.e. 
1. Ulex. Calyx nearly as long as the cor., bibracteolate, 2-partite; 
upper segment slightly 2-toothed, lower 3-toothed. Keel blunt. 
Legume turgid. Leaves simple. 
2. Genis ta. Calyx much shorter than the cor., 3-cleft, two upper seg- 
ments entire, lower one 3-toothed. Keel blunt. Leaves simple 
• or trifoliolate. 
3. Sakotiiamnus. Calyx much shorter than the cor., ebracteolate, 2- 
lipped, upper lip 2-toothed, lower 3-toothed. Keel blunt. Legume 
flat. Leaves simple or trifoliolate. 
4. Ononis. Calyx much shorter tharLthe cor., nearly equally 5-cleft. 
Keel rostrate. Leaves simple or trifoliolate. 
5. Anthyllis. Calyx oblique at the mouth with 5 nearly equal teeth. 
Keels without a beak. Leaves pinnate. 
II. Stamens diadelphous. Leaves 3 — 5 -foliolate. Tkifo r.lE.E. 
6. Medicago. Legume falcate or spirally twisted. Keel of cor. obtuse. 
Calyx teeth nearly equal. 
7. Mei.ilotus. Legume nearly straight. Keel obtuse. Calyx-teeth 
nearly equal. Flowers in long racemes. 
8. Trioonella. Legume straight or slightly curved, manv-seeded, 
much longer than the calyx. Petals distinct. Keel obtuse. 
Flowers capitate or in short racemes. 
9. Tripoli cm. Legume and ovary nearly straight, 1 — 4-seeded, scarcely 
longer than the calyx. Petals cohering by their claws. Keel 
obtuse. Calyx-teeth unequal. Flowers capitato-umbellate, or in 
short racemes. 
10. Lotus. Legume nearly straight. Keel rostrate. 
III. Stamens diadelphous. Leaves pinnate. Tendrils 0. Legume dehis- 
cent, several-seeded, imperfectly 2-celled by the introfiexion of one 
of the sutures. Astragali-:.!:. 
11. Oxytropis. Keel acuminated. Legume with the upper or seed- 
bearing suture indexed. 
12. Astragalus. Keel obtuse. Legume with the lower suture indexed. 
IV. Stamens diadelphous. Leaves pinnate. Tendrils 0. Legume indehis- 
cent, divided transversely into one or more l -seeded cells. Hedysare.e. 
13. Ornitiiopus. Flowers umbellate, bracteate. Keel small, obtuse. 
Legume compressed, contracted on both sides at the joints. 
