516 LEGUMINOSAE (PULSE FAMILY^ 



* * Pod dry, coriaceous, cartilaginous or memhranous, dehiscent. 

 t- Pod completely '2-celled, sessile. 



5. A. canadensis L. Tall and erect, 3-16 dm. high, somewhat pubescent of 

 glabrate ; leaflets 21-27, oblong ; flowers greenish cream-color, very numerous, 

 in long dense spikes; pods crowded, oblong (1.2 cm. long), glabrous, terete, 

 scarcely sulcate and only on the back, nearly straight. (^A. carolinianus L.) — ■ 

 Dry or gravelly soil, w. Que., shores of L. Cham plain, Vt, (Brainerd), N. Y. to 

 n. Ga., and far westw. July, Aug. 



6. A. adsiirgens Pall. Ascending or decumbent, 1-4.5 dm. high, cinereous 

 with minute appressed pubescence or glabrate ; leaflets about 21, narrowly ob- 

 long ; spike dense, with medium-sized pale or purplish flowers ; pubescence of 

 calyx appressed; pod oblong, 8-10 mm. \oxv^, finely pubescent, triangular-com- 

 pressed, vrlth a deep dorsal furrow, straight. — Keewatin to Minn., w. Kan., and 

 westw. (Asia.) 



7. A. hypogl6ttis L. Slender; stems 1.5-6 dm. long, diffusely procumbent 

 ©r ascending, v-ith a rather loose pubescence or nearly glabrous ; leaflets 15-21, 

 oblong, obtuse or refuse ; flowers violet, capitate ; calyx loosely pubescent ; pod 

 as in the last, but ovate and silky -villous. — Minn, to centr. Kan., and uorth- 

 westw. May-July. (Eurasia. ) 



t- •*- Pod not completely 2-celled. 



++ Pod stipitate, pendent. 



8. A. alpinus L. Diffuse, from a very loosely forking base, the prostrate or 

 decumbent branches 0.5-1.5 dm. long, smooth or slightly hairy ; leaflets 11-23 ; 

 flowers violet-pnirple, or at least the keel tipped with vic^let or blue ; calyx cam- 

 panulate ; pod narrowly oblong, short-acuminate, intensely black-pubescent inith 

 long slightly spreading hairs, triangular-turgid, deeply grooved on the back, 

 straight or curved, its stipe usually rather exceeding the calyx. — Rocky banks 

 and gravelly shores, Arctic Am., s. to Nfd., e. Que., and Col. (Eurasia.) 



Var. Brunetianus Fernald. Commonly larger, the branches mostly 2-6 dm. 

 long ; leaflets usually 15-29 ; mature pods greenish or pale brown, strigose with 

 shorter black or even whitish hairs. — Limestone ledges and gravelly shores, e. 

 Que. to Hudson B., s. to s. N. B., centr. Me., and Vt.; also in the Rocky Mts. 

 May-Sept. 



9. A. Robbinsii (Oakes) Gray. Nearly smooth and erect, 8 dm. high, slender ; 

 leaflets 7-11 ; calyx more oblong; floicers ichite ; pod oblong (1.2 cm. long), 

 obtu.se or acutish, minutely darkish-pubescent, somewhat laterally compressed, 

 not dorsally sulcate or obsoletely so, straight or somewhat incurved, rather ab- 

 ruptly narrowed at base into the often included stipe. — Rocky ledges of the 

 Winooski R., Vt. (station now extinct). 



10. A. Blakei Eggleston. Habit and foliage nearly as in the preceding, more 

 robust ; corolla larger, bluish-purple ; pod triangular in section, sulcate dorsally. 

 {A. Robbinsii, var. occidentalis Wats., var. jesupi Eggleston & Sheldon ; A. 

 Jesupi Britton ; A. occidentalis Jones.) — Rocky banks, n. Me. to Vt.; also in 

 Rocky Mts. 



11. A. racem5sus Pursh. Stout, 3-0 dm. high, erect or ascending, appressed- 

 pubescent or glabrate ; leaflets 13-25 ; flowers numerous, vMte, pendent ; calyx 

 campanulate, gibl^ous, white-pubescent ; pod straight, narrow, 2.5 cm. long, 

 acute at both ends, triangular-compressed, deeply grooved on the back, the ven- 

 tral edge acute. — Neb. to Mo., westw. and north westw. 



t-1- •+-*■ Pod sessile. 



12. A. parviflbrus (Pursh) MacM. Subcinereous, slender, 3 dm. or more 

 high ; leaflets 11-17, linear-filiform, 1.4-2 cm. long, olituse or retnse ; racemes 

 loose; flowers small (0 mm. long); pod pendent, 4-0 mm. long, coriaceous, 

 ellijjtic-ovate, concave on the back, the ventral suture prominent, v^hite-hairy, at 

 length glabrous, transversely veined. {A. gracilis Nutt.) — Minn, to Mo., and 

 westw. A. microlobus Gray, witli leaflets linear-oblong, refuse, 1-1.2 cm. long, 

 said to have been collected in Mo., is scarcely more than a variety of this. 



