|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Perennial from rhizome, emergent aquatic, glabrous
Stem ± erect, unbranched, rooting at nodes, hollow
Leaves simple, in whorls of generally 612, sessile, linear to elliptic, entire; stipules 0
Inflorescence: flowers solitary in upper axils, ± sessile
Flower inconspicuous, generally bisexual (or staminate below pistillate); calyx a minute rim at ovary top; petals 0; stamen 1, off-center on top of ovary; ovary inferior, chamber 1, style 1, off-center, ± = stamen, slender, generally in groove between anther sacs, ± entirely stigmatic
Fruit: achene or thin-walled drupe
Genera in family: 1 genus, 1 variable sp.: temp and cool regions. Wind-pollinated. Not closely related to Haloragaceae, to which the sp. is sometimes assigned.
Species in genus: 1 sp
Etymology: (Greek: horse tail)
Stem 36 dm; upper 1/41/2 emergent
Leaf 13.5 cm
Fruit 23 mm
Ecology: Margins of shallow ponds, springs, marshy and swampy areas, roadsides, irrigation ditches
Elevation: 02700 m.
Bioregional distribution: Northwestern California, High Cascade Range, Sierra Nevada, San Francisco Bay Area, San Bernardino Mountains, San Jacinto Mountains, Modoc Plateau
Distribution outside California: much of n hemisphere, Australia, s S.America
Horticultural information: shallow water: 1, 2, 3, 4, 5, 6, 7, 15, 16, 17; INV.