Hibiscus trionum

Flower-of-an-hour

Family: Malvaceae · Type: annual · Not Native

Flower-of-an-hour is a naturalized annual found in California's Central Valley and Foothills in disturbed places at elevations generally below 350 meters. Flowering from April to November, this plant produces delicate yellow flowers with a distinctive purple-black base, each bloom approximately 2 centimeters wide. Growing with erect stems 30 to 60 centimeters tall that can develop prostrate branches, it has a bristly texture. Its leaves are roughly 5 centimeters long, deeply 3 to 5-lobed, with coarsely toothed edges and stellate hairs on the underside. The fruit is enclosed within an inflated, papery calyx, measuring 1.5 to 2 centimeters long.

Habitat: Uncommon. Disturbed places

Bloom period: Apr-Nov

Elevation: generally < 350(1450) m

Bioregions: CA-FP

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