leguminosjE 75 



10. A. flezudsus, (Hook.) Dougl. 



Ascending, or rarely erect, branched at the base and loosely spreading, 

 10-15 in. high; leaflets 9-21, linear, oblong, or oblanoeolate; flowers purple, 

 in a very loose raceme, peduncles exceeding the leaves in height; pod 

 1-celled, sessile, cylindrical. Common across the prairies, usually growing 

 in patches, Man.-Alta. 



11. A. tenellus, Pursh. 



Slender, decumbent, 6-12 in. high, diffusely branched; leaflets 11-16, 

 linear to oblqng, pale green; racemes axillary, very loose-flowered, on short 

 peduncles; flowers small, yellowish white or pinkish; pod 1-celled, flattish, 

 oblong, pointed at both ends, on a slender stipe. {A. muUiftorus, Gray.) 

 Prairies from W. Man. to Rocky Mts. 



12. A. missouriSnsis, Nutt. 



Stems very low, tufted; leaflets 7-21, elliptical to obovate, usually obtuse; 

 whole plant densely hoary-pubfesoent throughout; flowers violet-purple, 

 tew in heads or short spikes; pod 1-oelled, about 1 in. long, wrinkled, sessile, 

 oblong, tapering to a point, leathery in texture, circular in section with the 

 ventral suture slightly keeled. Clay and alkaline flats, Sask. and Alta. 



13. A paucifl6rus. Hook. 



Dwarf from a woody rootstock, densely whitish-pubescent, leaves 

 crowded forming mats on the ground; leaflets 7-11, oblong to lanceolate; 

 flowers violet, 2-5 to a peduncle; pod linear, minutely silky-pubescent, less 

 than i in. long. W. Alta. 



14. A. triphyllus, fursh. 



Stems numerous from a woody rootstock; leaves usually 3-foliate, 

 crowded, on long petioles exceeding the peduncles, silvery-silky-pubescent, 

 flowers white or yellowish in crowded heads or spikes; pod enclosed in the 

 calyx, soft, hairy, somewhat conical. Dry gravelly ridges, Sask. and Alta. 



11. OXfTROWS. 



Stemless herbs, with odd-pinnate leaves of numerous leaflets, 

 from aji erect rootstock, and with flowers resembling those of 

 Astragalus except that the keel terminates in a sharp beak and the 

 spike is borne on a long naked scape. 



1. O. LambSrti, Pursh. 



Silky-pubescent with fine appressed hairs, 6-14 in. high, growing in 

 clumps; leaflets 9-19, mostly linear; flowers in short dense spikes or heads, 

 showy, reddish purple or yellowish white; scapes exceeding the leaves; 

 pod sessile, erect, incompletely 2-celled, leathery in texture and densely 

 silky-pubescent. Dry prairies, Man.-Alta. 



