83 
7. A. reflexus T. & G. Slender and branching, assurgent, 3 dm. or more high, 
pilose-pubescent: leaflets 13 or 15, cuneate-obovate, emarginate, 12 mm. long : flow- 
ers nearly sessile, few, subeapitate, bluish-white, spreading, 8 mm. long: pod thick- 
coriaceous, deflexed, ovate-triangular, glabrous, very deeply suleate dorsally (section 
obcordately 2-lobed), 8 mm. long.—In eastern Texas and possibly within our ran ge. 
8. A. Wrightii Gray. Low and villous-hirsute: leaflets 7 to 11, oblong, acutish: 
the few capitate flowers violet or whitish, with subulate-linear calyx-teeth equaling 
the corolla: pod coriaceous, oblong, hirsute, straight, subcompressed, bicarinate, 
acute, erect, half longer than the calyx.—In dry ground, central Texas between the 
Brazos and the Rio Grande. 
9. A. Nuttallianus DC. Stems ascending or erect, 7.5 to 45 em. high, minutely 
pubescent: leaflets 11 to 15, elliptical or oblong, obtuse or retuse: flowers few, sub- 
capitate or sometimes solitary on slender peduncles, light purple, small, 4 mm. long: 
pod coriaceous, linear, glabrous, subcompressed, incurved near the base, sulcate dor- 
sally, reticulated.—A pparently throughout Texas, where it seems to be the most com- 
mon Astragalus. Var. TRICHOCARPUS T. & G. is a low form with hispid calyx and 
slightly hairy pods.—Quite common near Brazos Santiago. 
10. A. leptocarpus T,& G. Almost glabrous : leaflets 13 to 17, cuneate-elliptical, 
retuse: flowers few, as in the last, but deep purplish blue and larger, 8 to 10 mm. 
long: pod membranaceous, linear, glabrous, subcompressed, straight, spreading, less 
reticulated, about 2.5 em. long.—From Arkansas through eastern Texas to San An- 
tonio and the lower Rio Grande. 
++ ++ Pod stipitate. 
11. A. Brazoensis Buck], Rather small and sparingly pubescent : leaflets emar- 
ginate: the small violet or whitish flowers in rather loose short spikes: pod thin- 
coriaceous, strongly obcompressed and nearly disk-like, 6 mm, broad, ineurved, gla- 
brous, transversely nerved, at length separating into two 1 or 2-seeded divisions, 
mostly deflexed : stipe equaling the calyx.—In southern Texas, between the Brazos 
and the lower Rio Grande. 
+ + Pod not completely 2-celled, and sessile (substipitate in the first species), 
12. A. Lindheimeri Eng. Many-stemmed, diffuse and glabrous: leaflets 13 to 17, 
narrow-oblong, mostly emarginate: raceme of violet flowers subcapitate : calyx-teeth 
subulate-setaceous, about twice longer than the tube: pod ascending upon a spread- 
ing pedicel, oblong-linear, 2.5 em. or more long, glabrous, subfalcate, compressed, 
transversely reticulate-veined, substipitate, bicarinate on the back and 2-celled to 
the middle, ventral suture acute,—In central Texas from the Brazos to the San An- 
tonio, 
13. A. distortus Torr. & Gray. Low, diffuse, many-stemmed, subglabrous: 
leaflets 17 to 25, oblong, emarginate: flowers in a short spike, pale-purple: calyx- 
teeth broad subulate, half shorter than the dark puberulent tube: pod ovate or lance- 
oblong, 12 to 18 mm. long, thick-coriaceous, glabrous, arched, subterete, minutely 
reticulated, somewhat grooved on the back, the ventral suture nearly flat.—Extend- 
ing from the Mississippi States to the Colorado. 
14. A. lotiflorus Hook. Hoary or cinereous with appressed hairs: stems very short: 
leatlets 7 to 13, lance-oblong: flowers yellowish, in few-flowered heads, with pedun- 
cles exceeding the leaves or very short: calyx campanulate, the snbulate teeth ex- 
ceeding the tube: pod oblong-ovate, 18 to 24 mm. long, acuminate, acute at base, ca- 
nescent, the back more or less impressed, the acute ventral suture nearly straight,— 
Extending from the plains into northern and western Texas. 
15. A. Reverchoni Gray. Sparingly pilose-canescent, with many leaves and pe- 
duncles from a very short stem: leaflets 13 to 17, ovate-lanceolate : flowers yellowish, 
capitate, with peduncles about equaling the leaves: calyx densely pilose, with long 
attenuate teeth: pod ovate-lanceolate, 2.5 to 3.5 em. long, acuminate, canescent, 
broadly faleate or straight. (Phaca cretacea Buekley).—In northern and central 
Texas. Intermediate between the last and the next, 
