Stylosanthlb. XLVll. LEGUMINOSiE. 2S9 



4. M. scuTELLATA. Snail. — Ped. 2-flowered; kg. unarmed, cochleate, or- 

 bicular, convex at the base, flat above, with concentric, spiral folds. — (J) Native 

 of S. Europe. Cultivated among flowers for the curiosity of its pods, which 

 much resemble snail shells. July, f 



Oto.— Several other species are equally curious with the above, and are sometimes found in our gardens. 



21. ASTRAGALUS. 

 Calyx 5-toothed ; keel of the corolla obtuse ; stamens diadelphous 

 (9 & 1) ; legumes 2-celled by the introflexion of the lower suture. — 

 Herbaceous or suffruticnse., with uiiequally pinnate leaves. " Hairs often, 

 fixed by the middle.''^ {T. 6f G.) 



1. A. Canadensis. Canadian Milk Vetch. 



Canescent, erect, diff"use ; stip. broad-lanceolate, acuminate ; Ifts. about 

 10 pairs with an odd one, elliptical, obtuse at both ends, the lowest ovate-obtuse ; 

 ped. about as long as the leaves, when in fruit shorter ; spikes oblong ; its. spread- 

 ing, somewhat reflexed ; leg. ovate-oblong, terete, suberect, smooth, 2-celled, 

 many-seeded, abrupt at the end and tipped with a permanent style. — IX River 

 banks, &c.. Can to Flor. At the ferry, Niagara Falls ! Stem bushy, about 3f 

 high, very leafy. Flowers greenish-yellow, in short, dense spikes. Pods i' in 

 length, leathery. Jl. Aug. 



2. A. OBCORDATUS. Ell. 1 



Nearly smooth, procumbent, branched; Ifts. 8 — 12 pairs, obcordate or 

 oblong-obovate ; ped. about as long as the leaves ; rac. 6 — 12 flowered, roimd- 

 ish ; leg. oblong, triangular, a little curved, acute at each end, the lower suture 

 sulcate. — Prairies and bottoms. 111. Met^d! N. Car. to Flor. Baldwin. Plant 

 but 4 — 6' long, branched at base. Leaves about 3' in length. Leaflets 3 — 6" by 

 1 — ij", lower ones roundish. Flowers blue, 4 — 5" long, frmt about 1'. 



22. PHACA. 



Gr. (paKrj, lentil, derived from 0ay(j, to eat. 



Calyx 5-toothed, keel obtuse ; stamens diadelphous (9 & 1 ) ; legume 

 continuous, turgid, 1 -celled; placenta swelling, several-seeded. — % 

 Lvs. unequally pinnate. Fls. in axillary, pedunculate racevies. 



1. P. NEGLECTA. Torr. & Grav. 



Erect, branching, nearly smooth ; Ifts. elliptical, 8—13 pairs (5—9, T. & 

 G.); stip. minute ; rac. many-flowered, rather loose; fe^. sessile, smooth, round- 

 ish-ovate, much inflated, with a deep groove at the ventral suture. — By streams 

 and lakes. Western N. Y. to Wiscon. LaphamJ Plant resembling Astragalus 

 Canadensis, but more slender and delicate. Stem 1— 2f high, terete. Leaflets 



9 15" by 3 — 5", minutely puberulent beneath. Flowers white, 10 — 20 in a 



raceme. Pods about f long, with many small seeds. Jn. Jl. 



2. P. RoBBiNsii. Oakes. 



St. erect, simple, striate; Ifts. 5—11, elliptical, very obtuse, terminal one 

 largest; stip. triangular-ovate; ped. long, erect, each with a short, ovate or ob- 

 long raceme; car. horizontal, twice as long as the calyx; keel obtuse, shorter 

 than the other petals ; kg. tipped with the recurved, persistent style. — Ledges, 

 banks of Onion River, Vt. Robbins! Plant nearly smooth. Stem slender, 

 8 — 14' high. Leaves remote, 2 — 4' long. Leaflets 4-— 8" by \\ — 3", petiolulate. 

 Racemes surpassing the stem, on peduncles 5 — IC loiig, 12 — 18-flowered. 

 Corollas white, about 5" long. Pods 1' long, 4 — 8-seeded. May, Jn. 



23. STYLOSANTHES. Swartz. 

 Gr. o-niXos, a style, av^os, a flower, i. e. a flower with a conspicuous style. 



Flowers of two kinds, c? Calyx somewhat bilabiate, bibracteolate 

 at base, the tube very long and slender, with the corolla inserted on 

 its throat; vexillum very broad ; stamens 10, monadelphous ; ovary 

 always sterile, with a very long style. 9 Calyx and corolla ; ovary 



