Pl. Vasc. Gen. 2: 50. 1837.
Shrubs, 0.3–1(–2) m, secondary branches and branchlets minutely and persistently short-hispid, slowly glabrescent, branchlets usually 0.5–1 mm diam. Leaves: blade narrowly oblanceolate to linear, 3–10 mm, margins entire [rarely dentate], surfaces glabrous; 1-veined from base. Pedicels 1–2.5 mm. Flowers: hypanthium hemispheric-campanulate, 1.5 mm wide, sides convex; sepals ovate-triangular, length nearly 2 times width, margins curved; petals 1.2–1.5 mm, shallowly hooded.
Phenology: Flowering Mar–Aug(–Sep).
Habitat: Open slopes and washes, rocky outcrops, limestone and igneous substrates, roadsides, chaparral, oak-juniper and mixed conifer-oak woodlands.
Elevation: 1200–1800 m.
Ariz., N.Mex., Tex., c, n Mexico.