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EQUISETACEAE HORSETAIL FAMILY

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.

EQUISETUM HORSETAIL, SCOURING RUSH
(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
NATIVE
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, Outer North Coast Ranges, High Cascade Range, n&c Sierra Nevada, s High Sierra Nevada, 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. 1 other subsp., in Europe, Asia. [Online Interchange]

Previous taxon: Equisetum X ferrissii
Next taxon: Equisetum laevigatum

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Equisetum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=50315, accessed on Oct 2 2014

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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.
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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.