50 Rydberg : Rocky Mountain flora 



Hamosa calycosa (Torr.) Rydb. 

 Astragalus calycosus Torr. inS. Wats. Bot. King Exped. 66. 1871. 



Ctenophyllum Grayi (Parry) Rydb. 

 Astragalus Grayi Parry; Wats. Am. Nat. 8: 212. 1874. 



Cystium platytropis (A. Gray) Rydb. 

 Astragalus platytropis A. Gray, Proc. Am. Acad. 6: 526. 1865. 



Cystium Coulteri (Benth.) Rydb. 

 Astragalus Coulteri Benth. PI. Hartw. 307. 1848. 



Cystium ineptum (A. Gray) Rydb. 

 Astragalus inept us A. Gray, Proc. Am. Acad. 6: 525. 1865. 



Cystium lentiginosum (Dougl.) Rydb. 

 Astragalus lentiginosus Dougl.; Hook. Fl. Bor.-Am. 1: 151. 1831. 



Cystium araneosum (Sheld.) Rydb. 

 Astragalus araneosus Sheld. Minn. Bot. Stud. 1 : 170. 1894. 



Cystium boiseanum (A. Nels.) Rydb. 

 Astragalus boiseanus A. Nels. Bot. Gaz. 53: 223. 1912. 



Atelophragma lineare Rydb. sp. nov. 



Homalobus aboriginum Rydb. Bull. N. Y. Bot. Gard. 2: 176, in 



part. 1901. 



Perennial with a woody taproot and short cespitose caudex; 

 stem grayish strigose, often tinged with purple, 2-4 dm. high; 

 stipules ovate or lanceolate, acute, 2-4 mm. long; leaves 5-6 cm. 

 long; leaflets 9-15, linear, 1-2 cm. long, 1-2 mm. wide, grayish 

 strigose; peduncles 5-10 cm. long; raceme 2-3 cm. long, in fruit 

 6 cm. long; calyx densely black-hairy; tube 3 mm. long; teeth 

 subulate, 2 mm. long; corolla about 8 mm. long, ochroleucous or 

 tinged with purple; keel tipped with dark purple; legume gla- 

 brous, stipitate; stipe 4-5 mm. long; body 25-28 mm. long, con- 

 vexly curved on both sutures, but much more strongly so on the 

 upper; the partial partition very narrow. 



This is related to A. glabriusculum (A. Gray) Rydb. and A. 



aboriginum (Richardson) Rydb., but differs from the former in the 



