Equisetum laevigatum is a rush-like perennial that rises from an underground rootstock structure. Normally the plant dies back over the winter, but some populations in the southwestern USA have individuals that can overwinter. The plant manifests jointed rough stems which are closed at the joints. The stem roughness are a result of inclusions of silica. Each stem exhibits longitudinal grooves that run vertically. Each joint has a sheath which is a minute pointed leaf-like structure. The species usually occurs along moist drainages in sandy and gravelly substrates.
The narrow green stems can attain heights ranging from 30 to 150 centimeters. The stems are generally unbranched and are capped with rounded cone-shaped sporangia. Stomata occur in single lines; moreover, the spherical spores of this species are green.
The appearance of this taxon is very similar to E. hyemale; moreover, The geometric arrangement of silica-tuberles at the shoot surface may be the best means to differentiate these two species.
- *Jepson Manual. 1993. Equisetum laevigatum. University of California, Berkeley, Ca
- *Flora of North America @ eFloras.org http://www.efloras.org/florataxon.aspx?flora_id=1&taxon
Regularity: Regularly occurring
Regularity: Regularly occurring
Localities documented in Tropicos sources
Canada (North America)
United States (North America)
Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
- Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville. http://www.tropicos.org/Reference/1103
- Lellinger, D. B. 1985. A Field Manual of the Ferns and Fern Allies of the United States and Canada. 389 pp. http://www.tropicos.org/Reference/1316
- Small, J. K. 1938. Ferns of the Southeastern States. 517 pp. http://www.tropicos.org/Reference/1353
- Mickel, J. T. & A. R. Smith. 2004. The Pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1–1054. http://www.tropicos.org/Reference/1025841
- Taylor, T. M. C. 1970. Pacific Northwest Ferns and Their Allies. 247 pp. http://www.tropicos.org/Reference/1292
- Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley. http://www.tropicos.org/Reference/1717
- Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley. http://www.tropicos.org/Reference/1719
- Flora of North America Editorial Committee, e. 1993. Pteridophytes and Gymnosperms. 2: i–xvi, 1–475. In Fl. N. Amer. Oxford University Press, New York. http://www.tropicos.org/Reference/10884
Equisetum laevigatum is broadly distributed across North America in including the entire western USA and Great Plains. The southeastern USA and New England are excluded from the range. In Canada, the taxon is widely found in the entirety of the southern half of Canada.
- *United States Department of Agriculture. 2010. Plants Profile: Equisetum laevigatum. USDA, Natural Resources Conservation Service, Washington DC
Catalog Number: US 26007
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): F. V. Coville & F. Funston
Locality: California, United States, North America
- Holotype: Eaton, A. A. 1903. Fern Bull. 11: 10.
Molecular Biology and Genetics
Barcode data: Equisetum laevigatum
Statistics of barcoding coverage: Equisetum laevigatum
Public Records: 4
Specimens with Barcodes: 6
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: N4 - Apparently Secure
Rounded National Status Rank: N5 - Secure