Cicada Milkvetch

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; keelpetals 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.