Equisetum laevigatum
Smooth scouring rush, Smooth Scouring Rush
Photo by Chez Brungraber
Family: Equisetaceae · Type: Herb · Native
Equisetum laevigatum (Smooth scouring rush) is a native California herb in the Equisetaceae family, recognized by single dark band and rounded cone tips.
Smooth scouring rush is a native perennial found in northwestern California, the high Cascade Range, Sierra Nevada, Central Valley, central western California, southwestern California, Great Basin, and desert regions at elevations below 3,000 meters. Growing in moist, sandy or gravelly areas, this distinctive horsetail produces a single type of green stem reaching 30 to 180 centimeters tall with segmented, jointed structure. The stems are characterized by distinctive sheaths 6 to 15 millimeters long, typically featuring a dark band at the tip and 10 to 26 teeth that are generally deciduous. Its unique botanical structure lacks branches, with a rounded cone tip that distinguishes it from other similar rush-like plants. This plant is particularly notable for its smooth, segmented green stems that create a distinctive architectural form in moist habitats.
Identification and appearance
Key characters: 5 sympatric species; distinguished by single dark band and rounded cone tips
Habitat and range
Habitat: Moist, sandy or gravelly areas
Elevation: < 3000 m
California counties: Trinity, San Bernardino, Siskiyou, Riverside, San Diego, Ventura, Santa Cruz, Santa Barbara, Plumas, San Luis Obispo, Tulare, Solano, Los Angeles, Mono, Inyo, Orange, Kern, Amador, Butte, Colusa, Contra Costa, Fresno, Humboldt, Lake, Lassen, Madera, Mariposa, Mendocino, Modoc, Monterey, Napa, San Joaquin, Sierra, Sonoma, Sutter, Tuolumne, Alpine, Calaveras, Santa Clara, Marin, Nevada, Kings, Shasta, El Dorado, Placer, Tehama, Glenn, Stanislaus, Alameda, San Francisco, Del Norte, Yolo, Imperial, Sacramento, Merced
Outside California: to British Columbia, eastern United States
How to tell it apart
vs Foeniculum: Equisetum has scale-like leaves in whorls; Fennel has feathery, thread-like leaf divisions.; vs Hippuris: Equisetum has fused scale-like leaves at joints; Hippuris has separate linear leaves in whorls.; vs Juncus: Equisetum stems have distinct joints with leaf whorls; Juncus stems are smooth without joints.; vs Elegia: Equisetum stems are rough and hollow with whorled scales; Elegia has smooth stems with overlapping leaf sheaths.; vs Pinus: Equisetum is an herbaceous plant with jointed stems; Pine is a woody tree with needle clusters.
Frequently asked questions
Is Equisetum laevigatum native to California?
Yes. Equisetum laevigatum is native to California (recorded as native).
Where in California does Equisetum laevigatum grow?
Equisetum laevigatum occurs in Trinity, San Bernardino, Siskiyou, Riverside, San Diego, Ventura, Santa Cruz, Santa Barbara and other counties, at elevations of < 3000 m.
What plant family does Equisetum laevigatum belong to?
Equisetum laevigatum is in the Equisetaceae family, genus Equisetum.
What habitat does Equisetum laevigatum grow in?
Equisetum laevigatum grows in Moist, sandy or gravelly areas.
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.