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.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems very short, acaulescent or subacaulescent, Stems prostrate, trailing, or mat forming, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy , Stems with 2-branched hairs, dolabriform, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules membranous or chartaceous, Stipules persistent, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence umbel-like or subumbellate, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals ochroleucous, cream colored, Petals blue, lavander to purple, or violet, Banner petal narrow or oblanceolate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Style persistent in fruit, Fruit a legume, Fruit unilocul ar, Fruit humistrate, lying on the ground, Fruit freely dehiscent, Fruit oblong or ellipsoidal, Fruit fleshy, Fruit exserted from calyx, Fruit beaked, Fruit hairy, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.