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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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