305] FLORA OF BOULDER, COLORADO 157 



252. XYLOPHACOS Rydb. 



626. X. Parryi (Gray) Rydb. [Astragalus Parryi Gray]. Par- 

 ry's MILK VETCH. 



On rocks, Gregory Canon road and other bare ridges in the 

 foothills, 5900-9000 ft. (Daniels, 638). 

 Wyoming to Colorado. 



627. X. Shortianus (Nutt.) Rydb. [Astragalus Shortianus 

 Nutt.]. Short's milk vetch. 



Dry plains, mesas, and ridges in the foothills, 5100-9000 tt. 

 (Daniels, 35). 

 Nebraska to Wyoming; Colorado to Arizona. 



253. HOMALOBUS Nutt. 



628. H. tenellus (Pursh) Britton [Astragalus tenellus Pursh ; 

 A. multiflorus (Pursh) Gray]. Slender milk vetch. 



Boulder Canon above Falls and at Eldora, 7000-10000 ft. 

 (Daniels, 539). Also at Ward, and mountains between Sun- 

 shine and Ward (Rydberg). 



Saskatchewan to Yukon; Minnesota and Nebraska to 

 Colorado and Nevada. 



629. H. decumbens Nutt. [Astragalus decumbens Gray]. De- 

 cumbent milk vetch. 



Valley lying west of South Boulder Peak and Bear Moun- 

 tain, 7000-7500 ft. (Daniels, 444). 

 Wyoming to Colorado. 



630. H. campestris Nutt. [Astragalus campestris Gray; A. 

 convallarius Greene]. Plains milk vetch. 



Meadows on Green Mountain, 6500-8100 ft. (Daniels, 316). 

 Montana to British Columbia ; Colorado to Utah. 



631. H. flexuosus (Dougl.) Rydb. [Phaca flcxuosa (Dougl.) 

 Hook.; Astragalus flexuosus Dougl.]. Flexile milk 

 vetch. 



Near Boulder (Rydberg). 



Saskatchewan to Alberta ; Minnesota to Kansas and 

 Colorado. 



