[From the Bulletin of the Torrey Botanical Club, 34: 417-437 1907.] 



Studies on the Rocky Mountain flora — XVill 



Per Axel Rydberg 



Homalobus divergens (Blankinship) Rydb. 



Astragalus divergens Blankinship, Mont. Agric. Coll. Sci. Stud. 



Bot. 1 : 73. 1905. 

 Homalobus caniporiini Rydb. Bull. Torrey Club 32 : 666. 1906. 



When I described Homalobus caviporiim I overlooked the facts 

 that the same species had already been published by Prof. Blankin- 

 ship and that he had even cited the type number of my type. He 

 had described the pod, however, as having a stipe, something that 

 I cannot find in any specimens at hand. 



Homalobus humilis sp. nov. 



Perennial with a cespitose caudex ; stems 2-10 cm. long, 

 grayish-strigose, decumbent or spreading ; stipules ovate, scarious, 

 2-3 mm. long; leaves 2-6 cm. long; leaflets 11 — 15, oblong, 

 3-6 mm. long, about 2 mm. wide, grayish-strigose beneath, 

 glabrate above ; peduncles 2—8 cm. long ; raceme short, 1-2 

 cm. long, 3— 8-flowered ; calyx strigose with black hairs ; tube 

 campanulate, 1.5-2 mm. long ; teeth triangular or triangular- 

 subulate, 1-1.5 mm. long; corolla purple, 'j-'i mm. long; legume 

 about 1.5 cm. long, 3 mm. wide, widest near the abruptly acute 

 apex, tapering towards the base, the upper suture nearly straight, 

 the lower strongly arched at the apex. 



This species most resembles H. divergens (Blankinship) Rydb. 

 in habit, but differs in the shape of the legumes, the darker corollas, 

 and in the less canescent leaves, which are glabrate above. It 

 grows on high arid mountain tops at an altitude of nearly 3,000 m. 



Utah : Mountain north of Bullion Creek, near Marysvale, 

 1905, Rydberg & Carlton 7147 (type); Delano Peak, 1905, nos. 

 i2ig and 12 ig a. . 



Homalobus microcarpus sp. nov. 



Homalobus campestris Rydb. Bull. Agr. Exp. Sta. Col. lOO : 209, 

 in part. 1906. Not H. campestris Nutt. 



417 



