Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Richard L. Hauke

Perennial from rhizome (above ground stem annual or perennial herb)
Stem generally erect, ridged lengthwise, hollow except at nodes, sometimes of 2 kinds (sterile, fertile); branches 0 or whorled and alternate leaves, sometimes solid
Leaves 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 per sp., spheric, green, unmarked, with 4 strap-like appendages
Genera in family: 1 genus, 15 species: worldwide except Australia, New Zealand
Reference: [Hauke 1978 Nova Hedwigia 30:385–455]



Etymology: (Latin: horse, bristle, from roots of E. fluviatile L.)


E. arvense L.


Stems 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
Ecology: Moist, disturbed areas
Elevation: < 3000 m.
Bioregional distribution: California Floristic Province, Modoc Plateau, White and Inyo Mountains
Distribution outside California: N.America, Europe, Asia
Horticultural information: IRR: 1, 4, 5, 6, 7, 15, 16, 17, 24 &SHD: 2, 3, 8, 9, 14, 18, 19, 20, 21, 22, 23; INV.

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bioregional map for EQUISETUM%20arvense being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Equisetum arvense
Retrieve dichotomous key for Equisetum
Overlay Consortium of California Herbaria specimen data by county on this map
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