STYLOSANTHES. XLVli. LEGUMINOS^E. 229 



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

 bicular, convex at the base, flat above, with concentric, spiral folds. Native 

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

 much resemble snail shells. July, f 



Obs. -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 

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

 Herbaceous or suffruticose, with wicqually pinnate leaves. " Hairs often 

 fixed by the middle." (T. $ G.) 



1. A. CANADENSIS. Canadian Milk Vetch. 



Canescent, erect, diffuse ; 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 ; As. spread- 

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

 many-seeded, abrupt at the end and tipped with a permanent style. 1J. River 

 banks, &c., Can to Flor. At the ferry, Niagara Falls ! Stem bushy, about 31 

 high, very leafy. Flowers greenish-yellow, in short, dense spikes. Pods ' 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 ; roc. 6 12 flowered, round- 

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

 sulcate. Prairies and bottoms, 111. Me^-dl N. Car. to Flor. Baldwin. Plant 

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

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



22. PHACA. 



Gr. (paKi), lentil, derived from ^ayo), to eat. 



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

 continuous, turgid, 1 -celled; placenta swelling, several-seeded. '2J- 

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



1. P. NEGLECTA. Torr. & Gray. 



Erect, branching, nearly smoo'th ; Ifls. elliptical, 8 13 pairs (5 9, T. & 

 G.); stip. minute; roc. many-flowered, rather loose; leg. sessile, smooth, round- 

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

 and lakes, Western N. Y. to Wiscon. Lapham! Plant resembling Astragalus 

 Canadensis, but more slender ana* delicate. Stem 1 2f high, terete. Leaflets 

 9 15" by 3 5", minutely puberulent beneath. Flowers white, 1020 in a 

 raceme. Pods about ' 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; cor. horizontal, twice as long as the calyx; keel obtuse, shorter 

 than the other petals ; leg. 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 1 J 3", petiolulate. 

 Racemes surpassing the stem, on peduncles 5 10' long, 12 18-flowered. 

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



23. STYLOSANTHES. Swartz. 

 Gr. o-ruXog, a style, aj/Soj, 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 



