LEGl'MINOS.E. (PULSE FAMILY.) CtZ 



-*- Pod lotig-stipitate, not sulcate, cross-sfction oval : Jlowers white or bluish, keel 



violet. 



20. A. aboriginum, Kicli. f/<>(iri/-i)ubpsr(>jit or suhvUlnus: stemn numer- 

 ous, rigiil : leaflets 3 to 6 jjairs, linear or •)Mon^r-laiicoolate : /W semi-elliptic. 



Mouiitaius of Colorado, northward tliroui^lioiit W. IJritisli America. 



21. A. glabriusculus, (Jray. Like the hust : ;;labrous or with Bhort 

 scattered hairs: Icaliets tliinner, green, linear-lanceolate: jhuI hnaolate-sub/itl. 

 cate, the stipe 2 to 3 times longer than the caly.x. — Proc. Am. Acad. vi. 204. 

 Mountains of Colorado and British America. 



•*- ■*- Pod short-atipitatey cross-sect ion obonitr, jmltrsrent with morn or less nigres- 

 cent hairs: Jloiccrs irhitr. 



22. A. Robbinsii, Gray, var. OCCidentalis, Watson. Pod much com- 

 pressed, tapering at base to a very short stijic, with no indication of a dorsal 

 sulcus. — Bot. King's Exp. 70. S. W. Colorado and Nevada. 



* * Pod more coriaceous, black- or rareli/ cinereous-pubescent, more or less triangu- 

 lar and semi 2-celled, the dorsal suture sulcate-impressed. 

 H- Pod lens-shaped, the cross-section obcordate, the ventral suture a little the murr 



qibbous. 



23. A. oroboides, llornem., var. Americanus, Gray. Suhciiicn'Mus 

 puberulent : stems 1 to 1^ feet high : leaflets 5 to 7 pairs, oi)long and oval or 

 often linear-oblong : flowers in a long secund raceme, the wings e.xceeding the 

 keel : ])od with gray pubescence ; stipe very short. — Proc. Am. Acad. vi. 205. 

 In the Kocky Mountains from Colorado northward into British America, 

 thence eastward to Labrador. 



■t- •«- Pod triangular, more impressed, the cross-section deephj obcordate, rather 

 straight or incurved, gibbous on the back: 



24. A. alpinus, L. Hairy-pubescent or glabrous: leaflets 6 to 12 fxiirs, 

 oval or oblong : racemes short or subcapitate, many-flowered : u-ings little if at 

 qU exceeding the rather large keel: pod straight or recurved, blark-villous or 

 -pubescent; stipe usually exceeding the calgx. — Colorado, Wyoming, and north- 

 ward to Arctic America; also in Maine and Vermont. 



25. A. sparsiflorus, Gray. Slightly appre.ssed-pilose, glabratc : leaflets 

 i to 6 jHiirs, (>l)()'-(ife or siibrounded : peduncles 3 to lOflowered : the emargi- 

 nate or bifid banner and the wings much exceeding the incurved keel: pint in- 

 curved, mottled; stipe verg short. — Proc. Acad. Philad. 1863, 60. Colonulo. 



§ IL Closely resembling the last, but villous or canescent, lower, and with yellotc- 

 ish floivers: pod semi-ovate or oblong, turgid, coriaceous, subtriangnlar, with 

 the back gibbous and more or less impressed, the ventral suture prominent. 



26. A. lotiflorus, Hook. Heads few-flowered: corolla liftle exceeding 

 Wie calyx : the cross-.section of the pod obovate, retu.se, or usually Itroadly ob- 

 cordate toward the base. — From Colorado and Wyouiing to Texju*. Nebr:i>kA, 

 and Hudson Bay. 



§ 12. Pod sessile, mnstl ii thick coriaceous and obcnmpressed, the impressed dorsal 

 suture more or less approaching the ventral, not 2-rellrd, pultcicrnt. — /.«»/*, 

 white-silky or hoary : flowers spicale or subiiij)itiit, , u.tutiilu vloltt or purplish 



