Jepson eFlora: Taxon page
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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 s), 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.
eFlora Treatment Author: Robert E. Preston & Richard L. Hauke
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Previous taxon: Equisetum hyemale subsp. affine
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botanical illustration including Equisetum laevigatum


Citation for this treatment: Robert E. Preston & Richard L. Hauke 2017. Equisetum laevigatum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 29, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on May 29, 2017.

Geographic subdivisions for Equisetum laevigatum:
NW, CaRH, SN (exc Teh), GV, CW (exc SCoRI), SW, GB (exc Wrn), D;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.