516 LEGUMINOSAE (PULSE FAMILY) 



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

 *- Pod completely ^-celled, sessile. 



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

 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. Champlain, Vt. (Brainerd), N. Y. to 

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



6. A. adsurgens 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 appre'ssed; pod oblong, 8-10 mm. long, finely pubescent, triangular-com- 

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

 westw. (Asia.) 



7. A. hypog!6ttis L. Slender; stems 1.5-6 dm. long, diffusely procumbent 

 or ascending, with a rather loose pubescence or nearly glabrous ; leaflets 15-21, 

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

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

 westw. May-July. (Eurasia.) 



*- -t- Pod not completely ^-celled. 

 -M- 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-purple, or at least the keel tipped with violet or blue ; calyx cam- 

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

 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, 3 dm. high, slender ; 

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

 obtuse 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. racemosus Pursh. Stout, 3-6 dm. high, erect or ascending, appressed- 

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

 campanulate, gibbous, 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 northwestw. 



++ - Pod sessile. 



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

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

 loose; flowers small (6 mm. long); pod pendent, 4-6 mm. long, coriaceous, 

 elliptic-ovate, concave on the back, the ventral suture prominent, white-hairy, at 

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

 westw. A. microlobus Gray, with leaflets linear-oblong, retuse, 1-1.2 cm. long, 

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



