Juncus bufonius
Toad rush, Toad Rush
Photo by Chez Brungraber
Family: Juncaceae · Type: Grass · Native
Juncus bufonius (Toad rush) is a native California grass in the Juncaceae family, recognized by NONE sympatric - geographically isolated. Parent species of varieties below.
Toad rush is a California native annual found in various bioregions across diverse habitats at low to moderate elevations. Flowering from March to June, this tiny plant produces inconspicuous greenish-white flowers in small, clustered arrangements throughout the plant. Growing with slender, generally branched stems just 2 to 10 centimeters tall and approximately 1 millimeter wide, it forms delicate, sprawling clusters. Its leaves are sparse, narrow, and cauline, measuring 0.5 to 1.5 millimeters wide, with typically 1 to 3 leaves per stem. The fruit is small and oblong, with perianth parts 2 to 7 millimeters long and sepals typically longer than petals.
Identification and appearance
Key characters: NONE sympatric - geographically isolated. Parent species of varieties below
Habitat and range
California counties: Ventura, San Bernardino, San Diego, Calaveras, Contra Costa, Fresno, Kern, Los Angeles, Riverside, San Joaquin, San Luis Obispo, Santa Barbara, Alameda, Amador, Butte, Humboldt, Lake, Monterey, Placer, Plumas, San Francisco, Tulare, Inyo, Orange, Lassen, San Mateo, Modoc, Madera, El Dorado, Sacramento, Napa, Santa Cruz, Mariposa, Marin, Sonoma, Yolo, Mendocino, Tehama, Solano, Colusa, Siskiyou, Shasta, Merced, Tuolumne, Santa Clara, Mono, Del Norte, Nevada, Trinity, Sutter, Stanislaus, Glenn, Sierra
How to tell it apart
vs Schoenoplectus: Juncus has leaf blades present; Schoenoplectus is leafless with only bladeless sheaths at base.; vs Carex: Juncus has round or flattened stems; Carex has triangular stems you can feel.; vs Luzula: Run finger along leaf edge - smooth = Juncus, hairy = Luzula.; vs Elegia: Juncus has small individual flowers; Elegia has showy papery bracts and branching structure.; vs Cyperus: Juncus has round stems and capsules; Cyperus has triangular stems and lens-shaped achenes.
Frequently asked questions
Is Juncus bufonius native to California?
Yes. Juncus bufonius is native to California (recorded as native).
Where in California does Juncus bufonius grow?
Juncus bufonius occurs in Ventura, San Bernardino, San Diego, Calaveras, Contra Costa, Fresno, Kern, Los Angeles and other counties.
What plant family does Juncus bufonius belong to?
Juncus bufonius is in the Juncaceae family, genus Juncus.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.