|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
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Annual, in water or on wet ground, monoecious
Stem slender, generally ascending under water, floating on surface, or prostrate on ground, generally much-branched
Leaves simple, generally opposite, 4-ranked, linear-lanceolate to spoon-shaped, entire; stipules 0
Inflorescence: flowers 13 per leaf axil, the group subtended by generally 2 whitish, inflated bracts
Flowers minute, unisexual; perianth 0
Staminate flower: stamen generally 1, filament elongate
Pistillate flower: ovary superior, ± obcordate, chambers 4, styles 2, thread-like
Fruit 0.61.6 mm (width generally ± = length), ± dry, ± grooved longitudinally, splitting into 4 achene-like units
Recent taxonomic note: Recently treated in expanded Plantaginaceae (= Veronicaceae sensu Olmstead et al.) that includes genera removed from Scrophulariaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531553; Olmstead et al. 2001 Amer J Bot 88:348361]
Horticultural information: DRN, DRY, SUN; DFCLT.
The only genus,
Species in genus: ± 40 species: tropical, temp
Etymology: (Greek: beautiful hair, from slender stems)
Reference: [Fassett 1951 Rhodora 53:137155,161182, 185194,209222; Philbrick & Jansen 1991 Syst Bot 16:478491]
Taxonomically difficult; mature fruit and 10X magnification needed for identification.
Plant mat-forming at water edge or with floating rosettes
Leaves extremely variable; floating, emergent, or terrestrial leaves generally spoon-shaped
Inflorescence: bracts subtending flowers 24, whitish, inflated, persistent in fruit
Fruit 1.21.8 mm, 1.21.7 mm wide, light brown to tan; grooves deep; wing generally uniformly wide from base to tip, transition to fruit wall gradual; pedicel 00.5 mm
Ecology: Becoming stranded by streams, ponds, or ditches, or submersed < ± 9 dm
Elevation: < 800 m.
Bioregional distribution: North Coast, North Coast Ranges, n Sierra Nevada Foothills
Distribution outside California: native to Europe
Scattered but spreading in nw US.
|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).|