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Studies on the Rocky Mountain flora— XVIII , 
Per AXEL RYDBERG 
Homalobus divergens (Blankinship) Rydb. 
Astragalus divergens Blankinship, Mont. Agric. Coll. Sci. Stud. 
se at ie Vas se 
Homatlobus camporum Rydb. Bull. Torrey Club 32: 666. 1906. 
When I described Homalobus camporum | 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, I-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, 7-8 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 1. 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. 
Uran: Mountain north of Bullion Creek, near Marysvale, 
1908, Rydberg & Carlton 7747 (type); Delano Peak, 1905, mos. 
7219 and 1279 a. 
Homalobus microcarpus sp. nov. 
Homalobus campestris Rydb. Bull. Agr. Exp. Sta. Col. 100: 209, 
in part. 1906. Not 7. campestris Nutt. 
417 
