Polystichum californicum
California sword fern
(c) Timothy McNitt, some rights reserved (CC BY), uploaded by Timothy McNitt · licence
Family: Dryopteridaceae · Type: Herb · Native
Polystichum californicum (California sword fern) is a native California herb in the Dryopteridaceae family, recognized by partial 2-pinnate division and leaflet size.
California sword fern is a native perennial found in northern California Coast Ranges, southern California Ranges, Sierra Nevada, and central western California in woodland, streambank, and rocky open slope habitats at elevations below 1,100 meters. This fern has a distinctive lanceolate blade with dark green fronds reaching 40 to 100 centimeters long, featuring pinnae generally 4 to 7 centimeters in length. Growing with robust, upright stems, the fern develops a complex structure with lance-ovate scales at its base measuring 3 to 4 millimeters wide. Its blade is characteristically 1- to partly 2-pinnate, creating a complex and elegant leaf structure with densely arranged pinnae. The fern features a delicate indusium with ciliate edges, contributing to its intricate botanical design.
Identification and appearance
Key characters: 8 sympatric species; distinguished by partial 2-pinnate division and leaflet size
Habitat and range
Habitat: Woodland, streambanks, to rocky open slopes
Elevation: < 1100 m
California counties: Sonoma, Alameda, Lake, Mendocino, San Luis Obispo, Siskiyou, Los Angeles, Marin, Santa Cruz, Santa Clara, Monterey, El Dorado, Napa, San Mateo, Humboldt, Butte, Calaveras, San Bernardino, Trinity, Tulare
Outside California: to British Columbia
How to tell it apart
vs Nephrolepis: Polystichum has bristle-tipped teeth and grows in wild habitats; Boston fern has smooth-edged leaflets and escapes from cultivation.; vs Dryopteris: Polystichum fronds feel prickly with bristle-tipped teeth; Dryopteris fronds feel smooth without bristles.; vs Polypodium: Polystichum has shield-shaped spore covers and bristly edges; polypody has naked round spore dots and smooth margins.; vs Struthiopteris: Polystichum has one frond type with bristly teeth; ostrich fern has separate narrow fertile fronds and smooth sterile ones.; vs Athyrium: Polystichum feels prickly and has shield-shaped spore covers; lady ferns feel soft with curved, elongated spore clusters.
Frequently asked questions
Is Polystichum californicum native to California?
Yes. Polystichum californicum is native to California (recorded as native).
Where in California does Polystichum californicum grow?
Polystichum californicum occurs in Sonoma, Alameda, Lake, Mendocino, San Luis Obispo, Siskiyou, Los Angeles, Marin and other counties, at elevations of < 1100 m.
What plant family does Polystichum californicum belong to?
Polystichum californicum is in the Dryopteridaceae family, genus Polystichum.
What habitat does Polystichum californicum grow in?
Polystichum californicum grows in Woodland, streambanks, to rocky open slopes.
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.