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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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

EQUISETACEAE

HORSETAIL FAMILY

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]

EQUISETUM

HORSETAIL, SCOURING RUSH


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

Native

E. hyemale L. subsp. affine (Engelm.) Calder & Roy L. Taylor

COMMON SCOURING RUSH


Stem perennial herb, of 1 kind, 60–210 cm, green, unbranched; sheath 7–17 mm, ± as long as wide, generally with 2 dark bands, 1 at base, 1 at tip, teeth 22–50, generally deciduous
Sporangia: cone tip pointed
Ecology: Streams, moist, sandy or gravelly areas
Elevation: < 2500 m.
Bioregional distribution: California Floristic Province, Warner Mountains, White and Inyo Mountains
Distribution outside California: N.America
(other subsp. in Eur, Asia)
Synonyms: var. californicum Milde; var. robustum (A. Braun) A.A. Eaton
Intermediates to E. laevigatum (aborted spores) are E. X ferrissii Clute (moist, sandy or gravelly areas; < 3000 m. CA-FP, W&I; to B.C., e US). Often mislabeled E. laevigatum (that sp. then miscalled E. kansanum)
Horticultural information: IRR: 1, 2, 3, 4, 5, 6, 7, 14, 15, 16, 17, 22, 23, 24 &SHD: 8, 9, 18, 19, 20, 21; INV; GRCVR; STBL.

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bioregional map for EQUISETUM%20hyemale%20subsp.%20affine being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Equisetum hyemale subsp. affine
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Overlay Consortium of California Herbaria specimen data by county on this map
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