Jepson Interchange (more information)
Print edition is available from the University of California Press
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This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants. |
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press |
| The second edition of The Jepson Manual (2012) is available from the University of California Press | |
| See also the Jepson eFlora, which parallels the Second Edition |
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 1–3 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 0.6–1.6 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 85:531–553; Olmstead et al. 2001 Amer J Bot 88:348–361]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 53:137–155,161–182, 185–194,209–222; Philbrick & Jansen 1991 Syst Bot 16:478–491]
Taxonomically difficult; mature fruit and 10X magnification needed for identification.
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Plant mat-forming at water edge or with floating rosettes
Leaves: submersed leaves linear-lanceolate; floating, emergent, or terrestrial leaves spoon-shaped
Inflorescence: bracts subtending flowers 2, whitish, inflated, persistent in young fruit
Fruit 1–1.5 mm long, wide, dark brown to black; groove shallow; wing uniformly wide from base to tip, transition to fruit wall abrupt; pedicel generally 0–0.5 mm
Ecology: Becoming stranded or submersed < ± 6 dm
Elevation: < ± 500 m.
Bioregional distribution: Northwestern California, Central Western California
Distribution outside California: w Oregon
| 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). |
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