46 RYDBERG: Rocky MOUNTAIN FLORA 
Acmispon elatus (Nutt.) Rydb. 
Hosackia elata Nutt.; T. & G. Fl. 1: 327. 1838. 
The former of the two species is common on the plains from 
Minnesota to Arkansas, Sonora, and Idaho; the latter is found in 
Washington, Oregon, and Idaho. A few more species are found 
in California. 
Psoralea stenostachys Rydb. sp. nov. 
Perennial with a horizontal rootstock; stem adsurgent or erect, 
branched, sparingly strigose and glandular-dotted, 3-5 dm. high; 
leaves digitately 3-foliolate; leaflets oblanceolate, 2-4 cm. long, 
from rounded to acute at the base, mucronate at the apex, 
sparingly strigose and conspicuously glandular-punctate; peduncles 
_ 5-15 cm. long; racemes elongate, many-flowered and lax: calyx 
densely white-strigose; tube 1.5 mm. long; teeth 0.5 mm. long, 
lanceolate or lance-ovate, acute; corolla white, 4 mm. long; pod 
densely white-hairy. 
This species is related to P. lanceolata Pursh and P. Purshit 
Vail, but differs from both in the elongate racemes and the acute 
calyx-lobes; from the former it differs also in the hairy pod, and 
from the latter in the narrower leaflets. It grows on sandy soil 
at an altitude of about 1,300—1,500 m. 
Urtan: Government Well, Toole County, June 7, 1900, M. E. 
Jones 6221 (type, in herb. N. Y. Bot. Gard.); Utah, July 2, 1888, 
M. E. Jones 1833. 
Psoralea stenophylla Rydb. sp. nov. 
Perennial with a horizontal rootstock; stem simple, about 5 
dm. high, slender, sparingly strigose and glandular-punctate; 
leaves digitately 3-foliolate or the lower 5-foliolate; leaflets narrowly 
linear, 2.5-5 cm. long, about 2 mm. wide, glandular-punctate 
and sparingly strigose; stipules linear, 5-8 mm. long; petioles 
about 3 cm. long; peduncles 8-10 cm. long; racemes elongate, 5 
cm. long or longer, lax; pedicels usually longer than the calyx; 
calyx sparingly strigose, conspicuously punctate; lobes triangular, 
acute, 0.5 mm. long; corolla about 4 mm. long; fruit not seen. 
This has the narrow leaflets of Psoralea micrantha, but the 
raceme is elongate and the sepals are acute as in the preceding 
species, from which it differs in the very narrow leaflets. If it 
has the densely hairy pod of that species and P. Purshii, it cannot 
be told from the material, but the young ovaries do not indicate 
