Calystegia malacophylla (Greene) Munz subsp. tomentella (Greene) Munz; C. occidentalis var. tomentella (Greene) Brummitt; C. polymorpha (Greene) Munz; Convolvulus occidentalis A. Gray subsp. fruticetorum (Greene) Abrams; C. polymorphus Greene; C. tomentellus Greene

Peduncles (1–)2–4-flowered. Bracts (1–)3–7 mm distant from sepals, usually linear to linear-elliptic or linear-oblong, sometimes oblanceolate, 4–13(–18) × 1–4(–5) mm, margins entire.

Flowering (Apr–)May–Aug(–Sep). Dry slopes, grassy, shrubby, rocky sites, conifer forests; (10–)30–1200(–1900) m; Calif., Oreg.

Plants with tomentellous to ± villous herbage from northern and southern Sierra Nevada, Greenhorn Mountains, and Mt. Pinos included here in subsp. occidentalis have been called Calystegia occidentalis var. tomentella, Convolvulus tomentellus, or Calystegia malacophylla subsp. tomentella.