Ammannia robusta

Grand ammania

Family: Lythraceae · Type: annual · Native

Grand ammania is a California native annual found in the North Coast Ranges, southern Sierra Nevada Foothills, Central Valley, Central Western California, southern California Coast, southern Channel Islands, and desert regions in wet places, drying ponds, and ditch margins at elevations below 500 meters. Flowering from June to August, this plant produces pale flowers small and subtle, with petals 2 to 4 millimeters long. Growing with stems ranging 10 to 100 centimeters tall, the plant has an upright habit in marshy environments. Its leaves are relatively narrow, measuring 1.5 to 8 centimeters long and 5 to 15 millimeters wide, arranged oppositely along the stem. The flowers feature 4 to 5 pale yellow stamens nestled in an urn-shaped hypanthium, creating delicate botanical clusters in wet habitats.

Habitat: Wet places, drying ponds, ditch margins

Bloom period: Jun-Aug

Elevation: < 500 m

Bioregions: NCoR, s SNF, GV, CW, SCo, s ChI (Santa Catalina Island), D

California counties: Orange, San Diego, Imperial, Colusa, Los Angeles, Riverside, Butte, Tulare, Ventura, San Bernardino, Sutter, Sonoma, Marin, Solano, Napa, Sacramento, Glenn, Yuba, Tehama, Lake, San Joaquin, Humboldt, Merced, San Mateo, Yolo, Stanislaus, Madera, Kings, Santa Barbara, Fresno, Kern

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