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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
Stem: annual to perennial herb, of 1 kind, 20–180 cm, green; sheath 7–17 mm, 3–12 mm wide, often with dark bands; teeth 14–32, deciduous or persistent; branches 0. Sporangia: cone tip pointed; spores white, misshapen.
Moist, sandy or gravelly areas; < 3000 m. North Coast, Klamath Ranges, Outer North Coast Ranges, Cascade Range Foothills, High Sierra Nevada, Great Central Valley, Central Western California (except Inner South Coast Ranges), South Coast, San Gabriel Mountains, Peninsular Ranges (except San Jacinto Mountains), Desert Mountains; to British Columbia, eastern United States. Hybrids between Equisetum hyemale, Equisetum laevigatum, reproducing vegetatively from fragmented stems, sometimes forming large populations, sometimes at great distance from parents. [Online Interchange]
Previous taxon: Equisetum arvense
Next taxon: Equisetum hyemale subsp. affine
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 18 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=24419, accessed on Sep 18 2014
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|Geographic subdivisions indicated for the distribution of Equisetum X ferrissii|| 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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(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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