Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Wayne P. Armstrong

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]


W. lingulata (Hegelm.) Hegelm.

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.

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