Calystegia macrostegia subsp. arida
Photo: parent species Calystegia macrostegia · Photo by Chez Brungraber
Family: Convolvulaceae · Type: Vine · Native
Calystegia macrostegia subsp. arida is a native California vine in the Convolvulaceae family, recognized by hairiness, single-tipped leaf lobes, smaller flowers.
Coastal morning glory is a California native perennial found in southern California, including the Santa Barbara Mountains, San Bernardino Mountains, and northern Peninsular Ranges in coastal scrub and chaparral at elevations below 1,000 meters. Flowering from May to June, this plant produces white flowers with pale pink or cream shading, emerging from lanceolate bracts 10 to 21 millimeters wide. Growing with slender, trailing or weakly climbing stems that are distinctly hairy, it spreads across the landscape with a flexible growth habit. Its leaves have rounded to square-shaped sinuses with single-tipped lobes, creating a delicate and intricate foliage pattern. The sepals measure 9 to 12 millimeters long, supporting a corolla that ranges from 24 to 34 millimeters in length.
Identification and appearance
Key characters: 10 sympatric species; key features are hairiness, single-tipped leaf lobes, smaller flowers
Habitat and range
Habitat: Coastal scrub, chaparral
Elevation: < 1000 m
Bloom period
Calystegia macrostegia subsp. arida blooms May-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 macrostegia subsp. arida native to California?
Yes. Calystegia macrostegia subsp. arida is native to California (recorded as native).
When does Calystegia macrostegia subsp. arida bloom?
Calystegia macrostegia subsp. arida blooms May-Jun.
What plant family does Calystegia macrostegia subsp. arida belong to?
Calystegia macrostegia subsp. arida is in the Convolvulaceae family, genus Calystegia.
What habitat does Calystegia macrostegia subsp. arida grow in?
Calystegia macrostegia subsp. arida grows in Coastal scrub, chaparral.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · 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.