280 ORDER XLIII. LEGUMINOS^. 



Genus XX.— EOBIX'IA. L. 1G— 10. 

 (After Eobln, a French botanist.) 



Calyx campanulate, 5-tootlied, the 2 upper sepals united 

 nearly to the summit, so as to give the calyx somewhat the ap- 

 pearance of being only 4-toothed. Vexilluin broad and large. 

 Keel obtuse. Stamens diadelphous. Style bearded next the 

 free stamen. Legume compressed, many-seeded, long, the pla- 

 cental suture margined. Seeds compressed. Leaves unequally 

 pinnate. Trees or shrubs, with stipular spines. 



1. R. Pseudaca'cia, (L.) A tree, \vith virgate branches. Leaves with 

 4 — 7 pairs of leaflets ; leaflets frequently alternate, oval, emarginate, 

 ■with setaceous stipules. Flowers odorous, in axillary racemes. Calyx 

 pubescent, spotted. Legumes 2 — 3 inches long, smooth. — White, ^ . 

 March — April A large tree among the mountains, 60 — 80 feet ; 

 smaller in the middle country. 30 — 70 feet. Common Locust. 



2. R. visco'sA, (Vent.) A small tree, with viscid branches. Leaves 

 with 5 — 7 pairs ; leaflets ovate, stipular spines very short. Petioles 

 glandular-viscid. Flowers inodorous, in axillary, erect racemes. Leg- 

 umes obliquely-lanceolate, mucronate, 3 — 5-seeded, glandular-viscid. — 

 White, tinged with red. '^ . Mountains. Car. and Geo. 20 — 40 feet. 



3. R. His'piDA, (L.) A small shrub, the j^oung branches reddish, his- 

 pid. Leaves unequally pinnate ; leaflets oval, nearly round, mucro- 

 nate, almost destitute of stipular spines. Racemes loose. Flowers ino- 

 dorous, axillary. — Rose-color. '^ . April. Mountains. 3 — 6 feet. 



Var. Ro'sa, (Pursh.) Leaflets mostly scattered, not hispid ; stipules 

 spiny ; yoimg branches, petioles, and under surface of the leaves pu- 

 bescent. — Middle Car. and Geo, 2 — 4 feet. 



Var. Na'na, (Ell.) Very small shrub, scarcely a foot high. — Near 

 Columbia, So. Car., and Macon, Geo. 



Genus XXL— TEPHRO'SIA. Pers, 16—10. 

 (From tephros, ash-colored, in allusion to the general color of some of the species.) 



Calyx 5-toothed ; teeth subulate, nearly equal ; no bracts at 

 the base of the calyx. Vexillum large, nearly round, spread- 

 ing or reflexed. Generally monadelphous. Style usually 

 bearded, fihform. Legume sessile, compressed, coriaceous, 

 many-seeded. Seeds compressed. Herbaceous plants, with 

 unequally pinnate leaves. 



1, T. Virginia'na, (Pers.) Stem erect, pubescent, in dense branches, 

 slightly angular. Leaflets numerous, oblong-lanceolate, mucronate, 

 silky-pubescent. Flowers in terminal racemes, compact. Calyx deeply 

 6-cleft, hairy. Legume compressed, hairy. Seeds reniform. — Dull yel- 

 low, tinged with purple. If. May — July. Common in pine barrens. 

 10 — 15 inches. 



2. T, paucifo'lia, (Nutt.) Stem erect or decumbent, pilose, hispid, 

 with rusty hairs. Leaves scattered, few ; leaflets 4 —7 pairs, elliptic, 



