Perennials, rhizomatous. Herb­age tomentellous, tomen­tose, or villous. Stems ascending-decumbent, to 50 cm, sometimes almost absent. Leaves in basal rosettes; blade usually triangular, sometimes notably 3-lobed, to 40 mm, base ± lobed, lobes oblong to triangular, 1–3-pointed, margins ± undulate or not, apex rounded to acute. Bracts immediately subtending sepals, lanceolate, linear-elliptic, or ovate, 5–17 × 1.5–14 mm. Flowers: sepals 8–13 mm; corolla white, (25–)27–50(–55) mm.

Distribution

California.

Discussion

Subspecies 5 (5 in the flora).

Selected References

None.

Lower Taxa

Calystegia collina subsp. apicum, Calystegia collina subsp. collina, Calystegia collina subsp. oxyphylla, Calystegia collina subsp. tridactylosa, Calystegia collina subsp. venusta

Key

1	Leaf blades notably 3-lobed, lobes oblong to triangular, margins not notably undulate; bracts 1.5–3.5 mm wide.	Calystegia collina subsp. tridactylosa
1	Leaf blades triangular, usually basally lobed and lobes 1–3-pointed, weakly lobed in subsp. collina, margins undulate or not; bracts 4–14 mm wide.	> 2
2	Sepals glabrous or medially strigose.	> 3
3	Leaf blades ± triangular, base weakly lobed, lobes seldom well developed, apex rounded to subacute.	Calystegia collina subsp. collina
3	Leaf blades broadly triangular, basal lobes well developed, apex acute.	Calystegia collina subsp. oxyphylla
2	Sepals, at least outers, hairy, hairs appressed.	> 4
4	Leaf blades mostly 40 × 40 mm, margins not undulate.	Calystegia collina subsp. apicum
4	Leaf blades mostly 10–20 × 10–20 mm, margins undulate.	Calystegia collina subsp. venusta