m 



STYL0S4NTHE3. XLVll. LEGUMINOS^. 229 



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

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

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

 much resemble snail shells. Jul3\ f 



04s.— Several other species are equally curious with the above, and are sometimes found in our gardens. 



21. ASTRAGALUS. 

 Calyx 5-tootlied ; keel of the corolla obtuse ; stamen* diadelplious 

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



Herbaceous or svjfruticose, with unequally ]nn?uUe leaves. " Hairs often 

 fixed by the middle.'''' [T. tj- G.) 



' 1. A. Canadensis. Canadian Milk Vetch. 



Canescent, erect, diffuse ; slip, broad-lanceolate, acuminate ; Ifts. about 

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

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

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

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

 banks, &c.. Can to Flor. At the ferry, Niagara Falls! Stem bu-shy, about 3t 

 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; If is. 8 — 12 pairs, obcordate or 

 oblong-obovate ; ;;«?(/. about as long as the leaves; roc. 6 — 12 flowered, round- 

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

 sulcate. — Prairies and bottoms, 111. Mct.:d! N. Car. to Flor. Baldwin. Plant 

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

 1 — 11", lower ones roundish. Flowers blue, 4 — 5" long, fruit about 1'. 



22. PHACA. 



G-r. (paK)], lentil, derived from t/iayto, to eat. 



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

 continuous, turgid, 1-celled; placenta swelling, several-seeded. — 11- 

 Xfs. unequally pinnate. Fls. in axillary., pedunculate racemes. 



1. P. NEGLECTA. Torr. & Gray. 



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

 G.); s/i;;. minute ; rffc. many-flowered, rather loose; Zco-. sessile, smooth, round- 

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

 and lakes, Western N. Y. to Wiscon. Lapliam! 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 

 lar'^est- slip, triangular-ovate; ped. long, erect, each with a short, ovate or ob- 

 lon'^ raceme ; cor. horizontal, twice as long as the calyx ; keel obtuse, shorter 

 than the other'petals; Zc"-. tipped with the recurved, persistent style.— Ledges, 

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

 8_14' high. Leaves remote, 2 — 4' long. Leaflets 4 — 8" by li— 3", petiolulate. 

 Racemes surpassing the stem, on peduncles 5—10' long, 12 — l8-flowered. 

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

 23. STYLOSANTHES. Swartz. 



Gr. OTuXoff, a style, ai/S-oj, a flower, i. e. a flov^-er with a conspicuous style. 



Plowers 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 



