White Prairie Clover

Petalostemon sonorae Rydberg, sp. nov
A perennial, woody at the base; stems erect, strict, 3-5 dm. high, striate, branched above; leaves scattered, ascending, 3-5 cm. long; stipules subulate; leaflets 5-7, linear-oblong, 8-15 mm. long, 1-3 mm. wide, glabrous, minutely punctate beneath, obtuse; spikes oblong, dense, in fruit 8-10 mm. thick, 1-3 cm. long; bracts lanceolate, caudate-attenuate, with a subulate tip, longer than the calyces and buds, glabrous; calyx about 3 mm. long; tube 10-ribbed, glabrous; lobes less than 1 mm. long, triangular-ovate, acute, minutely ciliolate; corolla white; blade of the banner reniform-cordate, 2 mm. long, 3 mm. broad, the claw 3 mm long; blades of the other petals oblong, 3 mm. long, the claws 1.5 mm. long; pod obliquely obovoid.
Type collected at Rio de Santa Cruz, Sonora, June 25, 1855, Schott (Mex. Bound. Surv. no. 241, in part; herb. N. Y. Bot. Gard.).

Petalostemon truncatus Rydberg, sp. nov
A perennial, branched at the woody thick base; stems several, decumbent, glabrous, angled, conspicuously punctate, 2-4 dm. high, glabrous; leaves numerous, 2-3 cm. long; stipules subulate; leaflets 5-7, linear or linear-oblanceolate, 6-10 mm. long, rarely more than 1 mm. wide, involute, glandular-dotted beneath; spikes solitary at the ends of the stems or branches, oblong or those of the branches sometimes subglobose, in fruit dense, 8-10 mm. thick, 1-2 cm. long; bracts lanceolate, acuminate, shorter than the calyces, deciduous; calyx 3 mm. long; tube 10-ribbed; lobes triangular-ovate, less than 1 mm. long; corolla white; blade of the banner reniform, 2 mm. long, 3 mm. wide, the claw 3 mm. long; blades of the other petals rectangular-oblong, rounded at the apex, truncate at the base, 3-3.5 mm. long, nearly 2 mm. wide, the claws 1 mm. long; pod obliquely obovoid, 3 mm. long, nearly straight on the back.
Type collected at Tepehuanes, Durango, June, 1906, Ediv. Palmer 284 (herb. N. Y. Bot. Gard.). Distribution: Durango, Chihuahua, and Texas.

Dalea candida var. oligophylla, the western prairie clover, is a perennial plant in the legume family (Fabaceae) found in the Colorado Plateau and Canyonlands region of the southwestern United States.: 44