368 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Pods somewhat flattened, pendent, smooth and 



shining 15. P. stenophylla. 



Pods not at all flattened. 



Flowers and pods reflexed 16. P. collina. 



Flowers spreading; pods erect 17. P. tweedyi. 



One of the sutures of the pod impressed or intruded. 

 Pods compressed. 



Pods reflexed, the dorsal suture intruded 



to divide the pod into 2 cells 13. P. misella. 



Pods pendent, the ventral suture intruded. 14. P. alpinn. 

 Pods obcompressed, the dorsal suture impressed. 



Leaflets glabrous, broadly oval 18. P. bechrithii. 



Leaflets pubescent, lance-oblong 19. P. arreda. 



Pods sessile or nearly so. 



Pods 2-ceIled by the intrusion of the sutures. 



Flowers greenish or yellowish ; pods oblong 20. P. morton i. 



Flo\i'ers purple or purplish. 



Pods oblong; flowers spicate 21. P. adsurgens. 



Pods ovate; flowers capitate 22. P. agrestis. 



Pods 1-celled. 



Flowers subsessile in the leaf axils; leaflets rigid, 



prickly-pointed 30. P. vindif-. 



Flowers in racemes or spikes; leaflets not rigid nor 

 prickly-pointed. 



Inflorescence racemose; pods not linear. 



Pods subglobose, pubescent, chartaceous. . 26. P. mlsera. 

 Pods oblong or ovate, coriaceous. 



Sutures of the turgid pod both promi- 

 nent ; flowers greenish 23. P. reventa. 



Sutures of the pod not both prominent, 

 the dorsal impressed. 



Flowers greenish; leaflets 21 to 29. 24. P. lioodlana. 

 Flowers purplish; leaflets 11 to 21. 25. P. conjuncta. 

 Inflorescence spicate; pods linear, chartaceous. 



Keel of the corolla with a long inflexed beak. 27. P. convallaria. 

 Keel of the corolla short-beaked. 



Calyx teeth nearly as long as the tube. 28. P. decmnhens. 

 Calyx teeth one-third as long as the 



tube 29. P. serotlna. 



1. Phaca lentiginosa (Dough). 



Astragalus lentiginosus 'Dong\.; Hook. Fl. Bor Am. 1: 1.51. 1830. 



'i Astragalus diaphanus Dougl.; Hook. Fl. Bor. Am. 1: 151. 1830. 



Type locality; "Subalpine ranges of the Blue Mountains." Collected by Douglas. 



Range; Washington to Nevada and California. 



Speci-MEns exami.ned; Coulee City, Piper 388.5; Henderson 2353; between Coulee City 

 and Waterville, Splllman, May, 1896; Wilson Creek, Lake d- Hull 663; Ellensburg, Piper 

 2674; Toppenish, Piper, July 10, 1897; Sprague, Sandherg <& Leiberg 132; Cow Creek, 

 Lyall in 1860; Klickitat County, Howell; Coulee City, Pipm' 3885; Washtucna, Cotton 975. 



Zonal distribution; Upper Sonoran. 



Astragalus diaphanus Dougl., said to be abundant "on sandy soil near the Great Falls 

 of the Columbia," has never been satisfactorily identified. While possibly referable to 

 A. lentiginosus, the characters of " pilose-scabrous " herbage and " linear falcate " pods point 

 strongly to some other species. 



