Dalea cyanea Greene

Parosela pilosissima Rydberg, sp. nov
A low shrub, 2-4 dm. high; branches purplish, puberulent when young, glabrate in age; leaves 1.5-3 cm Jong, spreading; stipules subulate, 3-5 mm. long; rachis sparingly pilose; stipels minute, subulate; leaflets 9-15, elliptic or oval, 2-4 mm. long, glabrous above, longpilose beneath; spikes peduncled at the ends of the branches, dense, cylindric-oblong, 1-3 cm. long; bracts acuminate, glandular-dotted; calyx-tube campanulate, 3 mm. long, pubescent; lobes lance-deltoid, 1 mm. long, acute; corolla blue; blade of the banner rounded at the apex, 4 mm. long, 3 mm. wide; blades of the other petals nearly alike, obliquely oblong, 4 mm. long, with a basal lobe on each side, that on the upper side somewhat larger; pod slightly pubescent.
Type collected at the city of Durango and vicinity, 1896, Palmer SOS (Gray Herbarium).

Parosela cyanea (Greene) Rose, Contr. U. S. Nat. Herb. 10: 105. 1906.
Dalea cyanea Greene, Pittonia 1: 153. 1888.
A perennial, with tufted stems; stem glabrous, angled, decumbent at the base, sparingly glandular-dotted, branched above, about 3 dm. high; leaves 2-3 cm. long; stipules lanceolate or subulate, 3-4 mm. long; rachis glabrous; stipels conic, gland-like; leaflets 9-13, elliptic, 7-10 mm. long, obtuse, glabrous on both sides, minutely glandular-dotted beneath; peduncles terminal, 1-4 cm. long; spikes head-like; bracts ovate, acuminate, glandular-dotted and sparingly pubescent on the back, densely pubescent on the margins; calyx-tube campanulate, 3 mm. long, densely pubescent; lobes lance-subulate, about equaling the tube; banner nearly white, the blade orbicular, 5 mm. long, the claw 4 mm. long; the other petals sky-blue, the blades obliquely obovate, 6-7 mm. long, those of the keel-petals with a smaller basal lobe, the claws 3-4 mm. long.
Type locality: Sierra Madre. back of Durango. Mexico. Distribution: Known only from the type locality.