Calystegia macrostegia subsp. cyclostegia
Photo: parent species Calystegia macrostegia · Photo by Chez Brungraber
Family: Convolvulaceae · Type: Vine · Native
Calystegia macrostegia subsp. cyclostegia is a native California vine in the Convolvulaceae family, recognized by intermediate characteristics make identification challenging.
Coastal morning glory is a California native perennial found in coastal scrub of the central California Coast, southern California Coast Ranges, northern and southern Channel Islands, western Transverse Ranges, and Peninsular Ranges at elevations below 350 meters. Flowering from March to August, this plant produces white to pink flowers with large, widely ovate bracts 6 to 20 millimeters long. Growing with trailing or climbing stems 1 to 2.5 meters long, it spreads across coastal landscapes with a glabrous to slightly hairy appearance. Its leaves are distinctive, featuring triangular shapes with lobes that have two-pointed tips and acute to rounded sinuses. The large white to pink flowers reach 28 to 52 millimeters long, with sepals 9 to 15 millimeters in length.
Identification and appearance
Key characters: 17 sympatric species; intermediate characteristics make identification challenging
Habitat and range
Habitat: Coastal scrub
Elevation: < 350 m
California counties: Los Angeles, Ventura, San Luis Obispo, Santa Barbara, Monterey, San Diego, Orange, San Bernardino, San Mateo, Mendocino, Riverside, Solano
Bloom period
Calystegia macrostegia subsp. cyclostegia blooms Mar-Aug.
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 macrostegia subsp. cyclostegia native to California?
Yes. Calystegia macrostegia subsp. cyclostegia is native to California (recorded as native).
When does Calystegia macrostegia subsp. cyclostegia bloom?
Calystegia macrostegia subsp. cyclostegia blooms Mar-Aug.
Where in California does Calystegia macrostegia subsp. cyclostegia grow?
Calystegia macrostegia subsp. cyclostegia occurs in Los Angeles, Ventura, San Luis Obispo, Santa Barbara, Monterey, San Diego, Orange, San Bernardino and other counties, at elevations of < 350 m.
What plant family does Calystegia macrostegia subsp. cyclostegia belong to?
Calystegia macrostegia subsp. cyclostegia is in the Convolvulaceae family, genus Calystegia.
What habitat does Calystegia macrostegia subsp. cyclostegia grow in?
Calystegia macrostegia subsp. cyclostegia grows in Coastal scrub.
Related species
Other California species in the same genus, family, or bioregion.
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.