Jepson Flora Project: Jepson Interchange    

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

Annual, perennial herb, submersed, emergent, floating, or on wet ground
Leaves simple, alternate or whorled, ± in basal rosette or not; blade linear (especially underwater) to round, sagittate or cordate or not, bases generally sheathing, veins parallel; petioles sometimes inflated or 0 (especially underwater)
Inflorescence: raceme, spike, panicle, or 1-flowered, terminal but often appearing ± axillary, subtended by sheathing bract
Flower bisexual, radial or ± bilateral; perianth lobes generally 6, in 2 series of 3, petal-like; stamens equal or not, attached to perianth tube at various levels, 3, 6, (1, 4), sometimes 3 sterile, modified; ovary superior, 1–3-chambered
Fruit: 1-seeded utricle or many-seeded, loculicidal capsule
Seeds small, longitudinally ribbed or not
Genera in family: ± 6 genera, 30 species: most pantrop, some temp. Some cultivated as orns, some weeds, especially in rice fields
Reference: [Rosatti 1987 J Arnold Arb 68:35–71]



Perennial, generally free-floating
Stems stout, erect, often connected by stolons
Leaves ± in basal rosette; blade generally ovate to round; petiole inflated or not, generally > blade
Inflorescence: spike, panicle, or 1-flowered
Flower ± bilateral; perianth funnel-shaped, lobes 6; stamens 6, unequal in length; ovary 3-chambered
Fruit: capsule
Seeds many, longitudinally ribbed
Species in genus: ± 7 species: native to Am tropical, perhaps Am subtropical, Africa; some widely naturalized
Etymology: (J.A.F. Eichhorn, Germany, 1779–1856)


E. crassipes (Mart.) Solms


Stem > 30 cm. LF < 10 cm wide
Inflorescence 5–15 cm, ± 3–35-flowered
Flower: perianth lilac or pale blue to white. Locally abundant
Ecology: Ponds, sloughs, waterways
Elevation: < 200 m.
Bioregional distribution: Great Central Valley, San Francisco Bay Area, South Coast, Peninsular Ranges
Distribution outside California: native to tropical America
Plants multiply, spread rapidly by vegetative means; perhaps the world's most troublesome aquatic weed.

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bioregional map for EICHHORNIA%20crassipes being generated
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).

Retrieve Jepson Interchange Index to Plant Names entry for Eichhornia crassipes
Retrieve dichotomous key for Eichhornia
Overlay Consortium of California Herbaria specimen data by county on this map
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