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Robert E. Preston & Richard L. Hauke

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.
1 genus, 15 species: worldwide except Australia, New Zealand. [Hauke 1993 FNANM 2:76–84] —Scientific Editors: Alan R. Smith, Thomas J. Rosatti.

(Latin: horse, bristle, from roots of Equisetum fluviatile L.)

Key to Equisetum

E. hyemale L. subsp. affine (Engelm.) Calder & Roy L. Taylor COMMON SCOURING RUSH
Stem: perennial herb, of 1 kind, 60–210 cm, green, scabrous; sheath 7–17 mm, ± as long as wide, generally with 2 dark bands, 1 at base, 1 at tip, teeth 22–50, generally deciduous; branches 0. Sporangia: cone tip pointed; spores green, spheric.
Streams, moist, sandy, gravelly areas; < 2500 m. North Coast, Klamath Ranges, High North Coast Ranges, Outer North Coast Ranges, Cascade Range, Sierra Nevada (except Tehachapi Mountain Area), Great Central Valley, Central Western California (except Inner South Coast Ranges), Southwestern California (except s Channel Islands), Warner Mountains, East of Sierra Nevada, Desert; North America, Mexico, Guatemala. [Equisetum hyemale var. californicum Milde; Equisetum hyemale var. robustum (A. Braun) A.A. Eaton] 1 other subsp., in Europe, Asia. [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 29 2015
Citation for this treatment: [Author of taxon treatment] 2013. Equisetum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 29 2015

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Geographic subdivisions indicated for the distribution of Equisetum hyemale subsp. affine Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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.