PIPER FLORA OF THE STATE OF WASHINGTON. 367 



2. Hedysarum sulphurescens Rydberg, Bull. Torr. Club 24: 251. 1897. 



Hedysarum flavescens Coult. & Fisher, Bot. Gaz. 18: 300. 1893, not Kegel & Schmalh. 

 1882. 



Type locality: Helena, Montana. 



Range: British Columbia to Saskatchewan and Wyoming. 



Specimens examined: Loomis, Elmer 551. 



ARAGAliLXJS. Locoweed. 



1. Aragallus gracilis A. Nelson, Erythea 7: 60. 1899. 



Type locality: "Limestone Range in the Black Hills, Wyoming." 

 Range: Washington to Montana and Wyoming. 



Specimens examined: Olympic Mountains, £'Zm«r 2532; Loomis, ^Zmer 595. 

 Professor Greene erects a new species, A. luUolns, on Elmer's 2532.a 



2. Aragallus monticola (A. Gray) Greene, Pittonia 3: 212. 1897. 

 Oxytropis monticola A. Gray, Proc. Am. Acad. 20: 6. 1885. 

 Type locality: Northwestern Wyoming. Collected by Parry. 

 Range: Washington to Wyoming, Dakota, and Alberta. 



Specimens examined: Olympic Mountains, Grant 21; Flett 134, 803; Goat Mountains, 

 AUen 245. 



PHACA. Milk vetch. 



Pods membranaceous, thin, much inflated. 



Herbage slightly pubescent ; pods 2-celled LP. lentiginosa. 



Herbage silky or villous; pods 1-celled. 



Pods very thin, 3 to 5 cm. long 2. P. hookeriana. 



Pods firm, 10 to 12 mm. long 3. P. suksdorfii. 



Pods coriaceous or chartaceous, not inflated. 

 Herbage long-hairy or woolly. 



Pods woolly or villous, not compressed. 



Pods 1-celled, somewhat curved, soft- woolly. 



Flowers ochroleucous 4. P. -purshii. 



Flowers purple. 



Stems elongate, prostrate; leaflets 21 to 2r>. ... 5. P. infexa. 



Stems erect, very short; leaflets 7 to 11 6. P. glareosa. 



Pods 2-celled, small, ovate, short-villous. 



Spike dense; flowers 10 mm. long 7. P. spaldimjii. 



Spike loose ; flowers 6 mm. long 8. P. lyallii. 



Pods glabrous, strongly compressed, falcate 9. P. succumbens. 



Herbage and pods glabrous or short-pubescent. 



Pods conspicuously stipitate, the stipe equaling or exceeding 

 the calyx. 



Calyx oblique; pods curved or coiled, the sutures promi- 

 nent. 



Pods coiled, glabrous 10. P. speirocarpa. 



Pods curved, not coiled. 



Leaflets 5 to 7 pairs, oblong or obovate; stipe as 



long as the calyx 1 1 . P. sinuata. 



Leaflets 6 to 9 pairs, linear; stipe much exceed- 

 ing the calyx 12. P. podocarpa. 



Calyx not oblique; pods straight or nearly so. 

 Neither suture of the pods impressed. 



oProc. Biol. Soc. Wash. 18: 17. 1905. * 



