Calystegia collina subsp. oxyphylla

Mount saint helena morning-glory, Mount Saint Helena Morning-Glory

Family: Convolvulaceae · Type: perennial · Native

Conservation status: CNPS 4.2

Mount saint helena morning-glory is a rare (CNPS 4.2) California native perennial found in the North Coast Ranges of Lake, Sonoma, and Napa counties in open grassy, rocky places, and oak or pine woodlands, often on serpentine soils at elevations below 600 meters. Flowering from April to June, this plant produces white to pale pink flowers 27 to 53 millimeters long with distinct corolla lobes. Growing with stems 8 to 15 centimeters tall, sometimes reaching 20 centimeters, it forms low-spreading or climbing vegetation. Its leaves have distinct lobes, with distinctive bracts 8 to 17 millimeters long that partially conceal the flower's calyx. The plant's sepals are either entirely glabrous or have strigose hairs concentrated at the center.

Habitat: Open grassy or rocky places or in open oak/pine woodland, often serpentine

Bloom period: Apr-Jun

Elevation: < 600 m

Bioregions: NCoR (Lake, Sonoma, Napa cos.).

California counties: Lake, Sonoma, Colusa, Napa, Marin, Mendocino

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.