Larrea tridentata subsp. glutinosa (Engelm.) E. Murray

Covillea glutinosa (Engelm.) Rydberg
Zygophyllnm califoi~nicum Torr. & Fr£m. in Frem. Rep. 257; hyponym. 1845.
Larrea glutinosa "Engelm. in Wisliz. Tour Northern Mex. 93. 1848.
Covillea divaricata Vail, Bull. Torrey Club 22 : 229. 1895. Not Larrea divaricata Cav. 1800.
A diffusely branched resinous shrub, 1-3.5 m. high, with grayish bark ; stems densely leafy, angled, silky-pubescent ; stipules reddish, very small, subulate ; leaves nearly sessile ; leaflets obliquely lanceolate or lunate, curved or somewhat falcate, 5-10 cm. long, 2-3 mm. wide, inequilateral, thick, coriaceous, resinous, yellowish, with a broad attachment to the rachis, silky-pubescent, becoming glabrate, more or less distinctly 3-ribbed ; peduncles 1 cm. long ; sepals round-ovate, obtuse, silky, the 2 outer nearly equal and smaller, the 3 inner unequal (1 smaller, 2 larger), broadly ovate, obtuse or truncate and often obscurely toothed ; petals slightly unguiculate, the limb spatulate-oblong, obtuse or acute or acutish and obscurely toothed, bright-yellow ; scales shorter than the filaments, variously 2-4toothed ; fruit subglobose or elliptic, 4-5 mm. broad, densely rusty-villous, beaked by the slender style ; hairs longer than the width of the carpels ; carpels obtuse.
Type locality : Olla and Fra Cristobal, New Mexico.
Distribution : Utah to southern California, Texas, and northern Mexico.