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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. telmateia Ehrh. subsp. braunii (J. Milde) Hauke GIANT HORSETAIL
Stem: annual, of 2 kinds. Sterile stem: 30–100 cm, light green; basal internode of branch < subtending sheath; sheath 7–18 mm, ± as long as wide, teeth 14–28, 4–10 mm; branches with 4–5 grooved ridges, solid. Fertile stem: 17–45 cm, fleshy, brown, ephemeral; sheath 1.5–4 cm, > that of sterile stem, teeth 20–30, 5–16 mm; branches 0.
Streambanks, roadside ditches, seepage areas; < 1000 m. Northwestern California (except High North Coast Ranges), High Cascade Range, n Sierra Nevada Foothills, n&c High Sierra Nevada, Central Western California (except Inner South Coast Ranges), Southwestern California (except San Jacinto Mountains); along coast to British Columbia. 1 other subsp., in Europe, Asia. Records from higher elevations are likely Equisetum arvense. [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 26 2015
Citation for this treatment: [Author of taxon treatment] 2013. Equisetum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 26 2015

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click for enlargement Equisetum telmateia subsp. braunii
See CalPhotos for additional images
© 2007 Neal Kramer

Geographic subdivisions indicated for the distribution of Equisetum telmateia subsp. braunii 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.