Jepson eFlora: Taxon page
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Equisetum hyemale subsp. affine

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 hyemale L. subsp. affine (Engelm.) Calder & Roy L. Taylor
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.
Ecology: Streams, moist, sandy, gravelly areas; Elevation: < 2500 m. Bioregional Distribution: NCo, KR, NCoRH, NCoRO, CaR, SN (exc Teh), GV, CW (exc SCoRI), SW (exc s ChI), Wrn, SNE, D; Distribution Outside California: North America, Mexico, Guatemala. Note: 1 other subsp., in Europe, Asia.
Synonyms: Equisetum hyemale var. californicum Milde; Equisetum hyemale var. robustum (A. Braun) A.A. Eaton
eFlora Treatment Author: Robert E. Preston & Richard L. Hauke
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botanical illustration including Equisetum hyemale subsp. affine


Citation for this treatment: Robert E. Preston & Richard L. Hauke 2017. Equisetum hyemale subsp. affine, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 22, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on May 22, 2017.

Geographic subdivisions for Equisetum hyemale subsp. affine:
NCo, KR, NCoRH, NCoRO, CaR, SN (exc Teh), GV, CW (exc SCoRI), SW (exc s ChI), Wrn, SNE, 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.