Psorothamnus arborescens var. pubescens (Parish) Barneby

Psorodendron amoenum (S. Wats.) Rydberg
Dalea amoena S. Wats. Am. Nat. 7: 300. 1873.
Parosela amoena Vail, Bull. Torrey Club 24: 17. 1897.
? Parosela Johnsoni minutifolia Parish, Bot. Gaz. 55: 308. 1913.
A low subspinescent shrub; branches short, strigose when young, glabrous and strawcolored in age, sparingly glandular; glands in the inflorescence subulate; leaves 2-3 cm. long, strigose-hoary; leaflets 5-13, linear, 4-8 mm. long, often rounded or subtruncate at the apex, 1-2 mm. broad; racemes 2-3 cm. long, 6-12-flowered; bracts and bractlets subulate, the latter minute; pedicels about 1 mm. long; calyx hoary; tube narrowly turbinate, 4 mm. long, 10ribbed; lobes all narrowly lanceolate, about equaling the tube; corolla dark bluish-purple; petals subequal, the blades 5-6 mm. long; blade of the banner broadly oval, retuse, those of the other petals obliquely oval, with a rounded basal lobe.
Type locality: Northern Arizona.
Distribution: Southern Utah and Nevada and northwestern Arizona.

Psorodendron pubescens (Parish) Rydberg, sp. nov
Parosela Johnsoni pubescens Parish, Bot. Gaz. 55: 308. 1913.
A shrub, 1 m. high or more; branches sparingly hairy when young, soon glabrous; leaves 3-5 cm. long, green, very sparingly hairy, conspicuously glandular-dotted; leaflets 7-9, linear, 10-15 mm. long, 1-2 mm. wide; racemes 4-5 cm. long; bracts and bractlets subulate; pedicels 1-2 mm. long; calyx sparingly hirsute; tube turbinate, 4 mm. long; lobes all lance-subulate, about equaling the tube; corolla purple; petals subequal, the blades about 5 mm. long, the claws 2 mm. long; blade of the banner suborbicular, deeply retuse, those of the other petals obliquely obovate, with a rounded basal lobe; pod obliquely ovate, .rather densely hoarypubescent and conspicuously glandular-dotted, the body nearly 1 cm. long, the beak somewhat shorter.
Type locality: Lee's Ferry, Arizona. Distribution: Known only from the type locality.