Calystegia collina subsp. collina
Photo: parent species Calystegia collina · (c) Adam J. Searcy, some rights reserved (CC BY) · licence
Family: Convolvulaceae · Type: Vine · Native
Calystegia collina subsp. collina is a native California vine in the Convolvulaceae family.
hill morning-glory is a California native perennial found in northern Coast Ranges, San Francisco Bay Area, and south-central Coast Ranges in open grassy or rocky serpentine places and oak/pine woodlands at elevations below 600 meters. Flowering from April to June, this plant produces white flowers with pink or cream tints, approximately 30 to 54 millimeters long. Growing with low-spreading stems 8 to 15 centimeters tall, it forms compact mats close to the ground. Its leaves are kidney-shaped to triangular with soft, largely indistinct lobes that blend smoothly into the stem. The plant's distinctive bracts are widely ovate, 8 to 15 millimeters long, which partially conceal the flower's calyx.
Habitat and range
Habitat: Open grassy or rocky places or in open oak/pine woodland, often serpentine
Elevation: < 600 m
California counties: Colusa, Lake, Napa, Sonoma, Marin, Santa Clara, Monterey, Glenn, Santa Barbara
Bloom period
Calystegia collina subsp. collina blooms Apr-Jun.
How to tell it apart
vs Convolvulus: Convolvulus has smaller flowers with sharply pointed stigma lobes; Calystegia stigma lobes are blunt.; vs Ipomoea: Ipomoea stigma is a single rounded knob; Calystegia stigma has two distinct flattened lobes.; vs Datura: Datura flowers are upright with pleated edges; Calystegia flowers are smooth funnels.; vs Abronia: Abronia has clusters of small tubular flowers; Calystegia has single large funnel flowers.; vs Oenothera: Oenothera has four separate petals; Calystegia petals are fused into continuous funnel.
Frequently asked questions
Is Calystegia collina subsp. collina native to California?
Yes. Calystegia collina subsp. collina is native to California (recorded as native).
When does Calystegia collina subsp. collina bloom?
Calystegia collina subsp. collina blooms Apr-Jun.
Where in California does Calystegia collina subsp. collina grow?
Calystegia collina subsp. collina occurs in Colusa, Lake, Napa, Sonoma, Marin, Santa Clara, Monterey, Glenn and other counties, at elevations of < 600 m.
What plant family does Calystegia collina subsp. collina belong to?
Calystegia collina subsp. collina is in the Convolvulaceae family, genus Calystegia.
What habitat does Calystegia collina subsp. collina grow in?
Calystegia collina subsp. collina grows in Open grassy or rocky places or in open oak/pine woodland, often serpentine.
Related species
Other California species in the same genus, family, or bioregion.
- Calystegia collina subsp. oxyphylla — Mount saint helena morning-glory
- Calystegia collina subsp. tridactylosa — Three-fingered morning-glory
- Calystegia collina subsp. venusta — South coast range morning-glory
- Calystegia felix — lucky morning- glory
- Calystegia longipes — Paiute false bindweed
- Calystegia macrostegia — Island false bindweed
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.