Jepson eFlora: Taxon page
Vascular Plants of California
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Equisetum laevigatum

Higher Taxonomy
Family: EquisetaceaeView Description 
Habit: Perennial herb from rhizome. Stem: annual to perennial herb, generally erect, of 2 kinds (sterile, fertile) or not; internodes with lengthwise alternating ridges and grooves, hollow except at nodes, branches 0 or whorled, alternate leaves. Leaf: scale-like, whorled, fused into nodal sheath with as many teeth as leaves, generally not green. Sporangia: several on inner surface of peltate scales that are clustered into a terminal cone; spores of 1 kind, spheric, green, unmarked, with 4 strap-like appendages.
Genera In Family: 1 genus, 15 species: worldwide except Australia, New Zealand.
eFlora Treatment Author: Robert E. Preston & Richard L. Hauke
Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Genus: EquisetumView DescriptionDichotomous Key


Etymology: (Latin: horse, bristle, from roots of Equisetum fluviatile L.)
Equisetum laevigatum A. Braun
Stem: annual (perennial herb in south), of 1 kind, 30--180 cm, green; sheath 6--15 mm, longer than wide, generally with 1 dark band at tip, teeth 10--26, generally deciduous; branches 0. Sporangia: cone tip rounded.
Ecology: Moist, sandy or gravelly areas; Elevation: < 3000 m. Bioregional Distribution: NW, CaRH, SN (exc Teh), GV, CW (exc SCoRI), SW, GB (exc Wrn), D; Distribution Outside California: to British Columbia, eastern United States.
Synonyms: Equisetum fontinale Copel.; Equisetum funstonii A.A. Eaton; Equisetum kansanum J.H. Schaffn.
Jepson eFlora Author: Robert E. Preston & Richard L. Hauke
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Equisetum hyemale subsp. affine
Next taxon: Equisetum palustre

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Botanical illustration including Equisetum laevigatum

botanical illustration including Equisetum laevigatum

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Citation for this treatment: Robert E. Preston & Richard L. Hauke 2012, Equisetum laevigatum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on June 23, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on June 23, 2024.

Equisetum laevigatum
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©2014 Neal Kramer
Equisetum laevigatum
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©2005 James M. Andre
Equisetum laevigatum
click for enlargement
©2014 Neal Kramer
Equisetum laevigatum
click for enlargement
©2014 Neal Kramer
Equisetum laevigatum
click for enlargement
©2008 Neal Kramer

More photos of Equisetum laevigatum
in CalPhotos

Geographic subdivisions for Equisetum laevigatum:
NW, CaRH, SN (exc Teh), GV, CW (exc SCoRI), SW, GB (exc Wrn), D
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).