46 Rydberg : Rocky Mountain flora 



Acmispon elatus (Nutt.) Rydb. 

 Hosackia elata Nutt.; T. & G. Fl. i: 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. now 



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. Purshii 

 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. 



Utah: 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 i8jj. 



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 - l° n g> 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 



