Fremont's Milkvetch

Cystium griseolum Rydberg, sp. nov
A cespitose perennial, with a woody caudex; stems ascending, 1-2 dm. high, strigose with kinky hairs, striate; leaves ascending, 3-5 cm. long; stipules deltoid, 4 mm. long, erect; leaflets 11-15, obovate, 5-7 mm. long, rounded to retuse at the apex, pubescent on both sides with kinky hairs; peduncles 1-4 cm. long; bracts lanceolate, 2 mm. long; calyx hirsutubous, the tube 3 mm. long, the teeth subulate, 1 mm. long; corolla white, tinged with rose, about 8 mm. long; banner obovate, bent at an angle of about 80°; wings shorter, the blade obliquely ovate, 27 obtuse; keel-petals similar but broader; pod glabrous, obliquely ovoid, 15-18 mm. long, 10 mm. thick, slightly arcuate.
Type collected at Candelaria, Nevada, May 1882, Shockley 220; also 27 1 (both in Gray Herbarium).

Cystium fremontii (A. Gray) Rydberg
Astragalus Fremontii A. Gray, in Torr. Pacif. R. R. Rep. 4: 80. 1857. Astragalus lentiginosus Fremontii S. Wats. Bot. King's Expl. 66. 1871. Astragalus Coulteri Fremontii M. E. Jones, Proc. Calif. Acad. II. 5: 669. 1895.
An annual, or a perennial according to the original description; stem 3-5 dm. high, finely strigose, thick; leaves 3-7 cm. long, ascending; stipules deltoid, 3-4 mm. long, deciduous; leaflets 9-13, obovate or oval, retuse, silky-strigose with rather long hairs, 10-15 mm. long, 6-8 mm. wide; peduncles erect, 5-7 cm. long; racemes about 5 cm. long, lax; bracts lance-subulate, 1-2 mm. long; pedicels very short; calyx dark-hairy, the tube 3 mm. long, the teeth deltoid, less than 1 mm. long; corolla about 1 cm. long, purple; banner obovate, bent at an angle of 60° or more; wings slightly shorter, the blades oblong, slightly curved, with a large rounded basal auricle; keel-petals shorter, the blade obovate-lunate, rounded at the apex; pod rounded-ovoid, about 2 cm. long and 1.5 cm. thick, glabrous, papery, many-seeded.
Type locality: Banks of Rio Virgin, Arizona or southern Utah. Distribution: Known only from the type locality.