Marrubium vulgare

White horehound

Family: Lamiaceae · Type: perennial · Not Native

Conservation status: Cal-IPC Yes

White horehound is a naturalized perennial herb found throughout California (excluding Western and Inyo regions) in disturbed sites and overgrazed pastures at elevations below 600 meters. Flowering from March to November, this plant produces small white flowers in clustered whorls along its stems. Growing with ascending to erect stems 10 to 60 centimeters tall, it forms a robust and spreading habit with multiple branches. Its leaves are wide-ovate to nearly round, 1.5 to 5.5 centimeters long, with rounded bases and crenate (scalloped) margins that give the foliage a soft, textured appearance. The plant's distinctive calyx has short, soft hairs and supports a corolla that extends slightly beyond the calyx lobes.

Habitat: Disturbed sites, generally overgrazed pastures

Bloom period: Mar-Nov

Elevation: < 600 m

Bioregions: CA (exc W&ampI)

California counties: Los Angeles, Placer, Riverside, Santa Barbara, San Diego, San Bernardino, Orange, San Luis Obispo, Kern, Ventura, Lake, Fresno, Tuolumne, Santa Cruz, San Mateo, Santa Clara, Shasta, Inyo, Tulare, Alameda, Yolo, Mendocino, Plumas, Siskiyou, Monterey, Solano, El Dorado, Colusa, Nevada, Amador, Mono, San Joaquin, Modoc, Sacramento, Butte, Calaveras, Lassen, Sutter, Yuba, Glenn, Tehama, Merced, Contra Costa, Napa, Humboldt, San Benito, Stanislaus, Alpine, Del Norte, Madera, Sonoma, Mariposa

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