300 NORTH AMERICAN FLORA [Volume 24 



keel-petals sharply arched, shorter than the wings; pod straight, acute at each end, 2-2.5 cm. 

 long, S mm. wide, with prominent sutures, strigulose, cross-reticulate and pitted; the exocarp 

 in age separating from the endocarp. 



Type locality: Cottrcll's Ranch. Henry Mountains. Utah. 



Distribution: Eastern Utah. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 50, f. 172; pi. 51 (as var. cymbellus). 



24. Xylophacos pygmaeus (Ntitt.) Rydb. Bull. Torrey Club 

 32:662. 1906. 



Phaca pygmaea Nutt.; T. & G. Fl. N. Am. 1: 349. 1838. 



Astragalus Chamaeluce A. Gray, in J. C. Ives, Rep. Colorado Riv. Hot. 10. 1860. 



Tragacanlha pygmaea Kuntze, Rev. Gen. 941. 1891. 



Astragalus Cicadae M. E. Jones, Zoe 4: 35. 1893. 



Astragalus Chamaeluce laccoliticus M. E. Jones, Contr. W. Bot. 7: 672. 1895. 



Astragalus Chamaeluce Cicadae M. E. Jones, Contr. W. Bot. 8: 12. 1898. 



Astragalus pygmaeus M. E. Jones. Rev. Astrag. 210. 1923. Not A. pygmaeus Pall. 1800. 



Astragalus pygmaeus Cicadae M. E. Jones, Rev. Astrag. 211. 1923. 



Astragalus pygmaeus laccoliticus M. E. Jones. Rev. Astrag. 211. 1923. 



A cespitose perennial, subacaulescent ; stems very leafy, 1-2 cm. long; leaves 2-6 cm. 

 long; stipules deltoid, strigose, about 2 mm. long; leaflets 5-11, broadly obovate, rounded to 

 acutish at the apex, 4-10 mm. long, 3-5 mm. wide, silky-strigose-canescent with white hairs; 

 peduncles 2-4 cm. long; racemes 3-S-flowered; bracts lanceolate, acute, 2-3 mm. long; calyx 

 strigose, often purple-tinged, the tube S-10 mm. long, the teeth subulate, about 2 mm. long; 

 corolla light-purple, nearly 2 cm. long; banner obovate, the claw exceeding the calyx-tube; 

 wings somewhat shorter, the blades narrowly oblong, arcuate, shorter than the claw; keel- 

 petals much broader, strongly arcuate above; pod obliquely ovoid, arcuate, mottled, strigose, 

 3-3.5 cm. long, 1 cm. broad, pulpy at first, the exocarp thin and papery, in age separated from 

 the endocarp by air-spaces. 



Type locality: Rocky Mountains on the hills of Ham's Fork of the Colorado of the West, 

 Wyoming. 



Distribution: Green River and Grand River basins of Wyoming. Colorado, and Utah. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 49, /. 170. 



25. Xylophacos musiniensis (M. E. Jones) Rydb. Bull. Torrey Club 

 40:49. 1913. 



Astragalus musiniensis M. E. Jones, Proc. Calif. Acad. II. 5: 671. 1895. 

 Astragalus musiniensis Ncivberryoides M. E. Jones, Rev. Astrag. 212. 1923. 



A perennial, with a deep taproot and cespitose caudex, almost acaulescent ; leaves ascend- 

 ing, 4-5 cm. long; stipules lanceolate, 7-S mm. long; petioles about 2 cm. long, strigose- 

 canescent; leaflets 1-5, lanceolate, 1.5-2.5 cm. long, silvery-strigose, acute; peduncles 2-4 cm. 

 long; racemes 1-3-flowered; bracts lanceolate, 1-2 mm. long; calyx purple-tinged, sericeous- 

 strigose, the tube about 1 cm. long, the teeth subulate, 2 mm. long; corolla purple, about 2 cm. 

 long; banner narrowly obovate, slightly arched; wings shorter, the blade lanceolate, with a 

 small auricle; keel-petals nearly as long, the blade broadly lunate, with a broad auricle, rounded 

 at the apex; pod ovoid, 2-2.5 cm. long, 1.5 cm. wide, somewhat arcuate and slightly sulcate, 

 the pericarp spongy and separating into membranous layers. 



Type locality: Ferren, Utah. 

 Distribution: Central Utah. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 4V, f. 17 1. 



5. Eriocarpi. Cespitose subacaulescent perennials. Leaves densely silvery strigose- 

 canescent. Pod short, more or less incurved-falcate, densely long-villous. Corolla ochro- 

 leucous or purplish, the petals (except the banner) lunate. 



