Ammi majus

Bishop's weed

Family: Apiaceae · Type: annual · Not Native

Bishop's weed is a naturalized annual found in northern coastal, northern coastal-rural, and Sacramento Valley regions in fields, roadsides, and disturbed areas at elevations generally below 1,000 meters. Flowering from May to July, this plant produces white flowers in delicate, branching clusters with 20 to 60 slender rays extending 2 to 7 centimeters. Growing 20 to 80 centimeters tall with erect, branching stems, it develops a complex, finely divided leaf structure. Its leaves are intricately 2-pinnately dissected with oblong blades 6 to 20 centimeters long, featuring segments approximately 10 to 15 millimeters in length. The small oblong fruits measure 1.5 to 2 millimeters long, contributing to its distinctive appearance in disturbed landscapes.

Habitat: Fields, roadsides, disturbed areas

Bloom period: May-Jul

Elevation: generally < 1000 m

Bioregions: NCo, NCoRO, ScV

California counties: Napa, San Joaquin, Sonoma, Ventura, Solano, Santa Barbara, Los Angeles, Riverside, San Luis Obispo, San Bernardino, Santa Clara, Butte, Orange, Contra Costa, Lake, San Diego, Yolo

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