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 |
Perennial, floating aquatics, small, clonal, in dense populations; new plants produced in budding pouch at base or along margins; may overwinter on bottom as dense, rootless, starch-filled daughter plant (winter bud); roots 0–many
Plant body 0.4–10 mm, flat and tongue-shaped to spheric
Flower 1, rarely seen, minute, appearing like 2–3 unisexual flowers, often sheathed by minute membrane; perianth 0; stamens 1–2; pistil 1, simple, maturing before stamens
Fruit achene-like, sometimes winged
Seeds 1–3, smooth or ribbed. Spp. best separated by chemistry and fruit; clones vary; magnification, backlighting generally needed to identify vegetative plants
Genera in family: 4 genera, 34 species: worldwide; ornamental in pools, aquaria
Reference: [Landolt 1986 Veröff Geobot Inst ETH Stiftung Rübel Zürich 71]Horticultural information: TRY.
Plants generally in unequal pairs; roots 0
Plant body 3–10 mm, thin-membranous, flat, linear to oblong, floating just below water surface; free ends generally recurved; budding pouch triangular, with track of long cells on lower surface between midline and margin; winter buds 0
Flower produced in cavity on upper surface; sheathing membrane 0; stamen 1; pistil 1
Seed smooth
Species in genus: 9 species: worldwide, especially warm temp, tropical
Etymology: (Diminutive of Wolffia)
Reference: [Landolt 1984 Veröff Geobot Inst ETH Stiftung Rübel Zürich 51:164–172]
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Plant body: ends recurved to form a semicircle when viewed from side; upper surface generally concave; budding pouch with track of long cells between middle and edge of lower wall
Ecology: Coastal and interior valleys
Elevation: < 200 m.
Bioregional distribution: North Coast, Sierra Nevada Foothills, Great Central Valley, Central Coast, San Francisco Bay Area, South Coast?
Distribution outside California: to se US, S.America
Variable. Small plants much like W. oblonga.
| 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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