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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. arvense L. COMMON HORSETAIL
NATIVE
Stem: annual, of 2 kinds. Sterile stem: 10–60 cm, green; basal internode of branch > subtending sheath; sheath 3–8.5 mm, ± as long as wide, teeth 6–14, 1.5–3.5 mm, dark, often joined but not fused; branch with 3–4 rounded ridges, solid. Fertile stem: 11–32 cm, unbranched, fleshy, brown, ephemeral; sheath 5–11 mm, > that of sterile stem, teeth 6–10, 3–7.5 mm.
Streambanks, wet meadows, springs, other wet, shaded places; < 3050 m. Northwestern California (except High North Coast Ranges), High Cascade Range, Sierra Nevada (except Tehachapi Mountain Area), Great Central Valley, Central Coast, San Francisco Bay Area, Southwestern California (except Channel Islands), Modoc Plateau, White and Inyo Mountains (White Mtns), Mojave Desert (except Desert Mountains); North America, Europe, Asia. [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 22 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=24416, accessed on Nov 22 2014

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Geographic subdivisions indicated for the distribution of Equisetum arvense 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.