Calystegia macrostegia subsp. intermedia
Photo: parent species Calystegia macrostegia · Photo by Chez Brungraber
Family: Convolvulaceae · Type: Vine · Native
Calystegia macrostegia subsp. intermedia is a native California vine in the Convolvulaceae family, recognized by medium-sized flowers and rounded leaf lobes.
Morning glory is a California native perennial found in southern coastal regions including the Southern California Coast, southern Channel Islands, southern Western Transverse Ranges, San Gabriel Mountains, and northern Peninsula Ranges at elevations generally below 200 meters. Flowering from March to August, this plant produces white to pale pink flowers large and bell-shaped, approximately 32 to 40 millimeters long. Growing with trailing or climbing stems that are glabrous to slightly hairy, it spreads across coastal and inland hills with flexible, sprawling habit. Its leaves have rounded to slightly angular lobes with acute to rounded sinuses, creating a distinctive heart-shaped outline. The plant's large bracts are lanceolate, 10 to 20 millimeters long and 6 to 12 millimeters wide, providing additional structural interest.
Identification and appearance
Key characters: 17 sympatric species; key features are medium-sized flowers and rounded leaf lobes
Habitat and range
Habitat: Coastal or inland hills
Elevation: generally < 200 m
California counties: Los Angeles, Ventura, San Diego, Orange, Riverside, Santa Barbara, Tulare, San Bernardino, San Luis Obispo, Sonoma, Monterey
Bloom period
Calystegia macrostegia subsp. intermedia 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. intermedia native to California?
Yes. Calystegia macrostegia subsp. intermedia is native to California (recorded as native).
When does Calystegia macrostegia subsp. intermedia bloom?
Calystegia macrostegia subsp. intermedia blooms Mar-Aug.
Where in California does Calystegia macrostegia subsp. intermedia grow?
Calystegia macrostegia subsp. intermedia occurs in Los Angeles, Ventura, San Diego, Orange, Riverside, Santa Barbara, Tulare, San Bernardino and other counties, at elevations of generally < 200 m.
What plant family does Calystegia macrostegia subsp. intermedia belong to?
Calystegia macrostegia subsp. intermedia is in the Convolvulaceae family, genus Calystegia.
What habitat does Calystegia macrostegia subsp. intermedia grow in?
Calystegia macrostegia subsp. intermedia grows in Coastal or inland hills.
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.