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Eichhornia crassipes

Higher Taxonomy
Family: PontederiaceaeView DescriptionDichotomous Key

Common Name: PICKEREL-WEED FAMILY
Habit: Annual, perennial herb, submersed, emergent, floating, or on wet ground. Leaf: simple, alternate or whorled, +- in basal rosette or not; blade linear (especially underwater) to round, sometimes sagittate or cordate, base generally sheathing, veins parallel; petiole inflated or not. Inflorescence: raceme, spike, panicle, or 1-flowered, terminal but often appearing +- axillary, subtended by sheathing bract. Flower: bisexual, radial or +- bilateral; perianth lobes 6 (in 2 series) [3,4], petal-like; stamens 3, 6 (in 2 series) [1,4], from various levels on perianth tube, equal or not, sometimes 3 sterile, modified; ovary superior, 1 or 3-chambered. Fruit: many-seeded, loculicidal capsule [1-seeded utricle]. Seed: < 1 cm, longitudinally ribbed [or not].
Genera In Family: +- 6 genera, 30 species: most pantropical, some temperate. Note: Some cultivated as orns, some weeds, especially in rice fields. Pontederia cordata L. establishes from garden waste.
eFlora Treatment Author: Charles N. Horn & Elizabeth McClintock
Scientific Editor: Thomas J. Rosatti.
Genus: EichhorniaView Description 

Common Name: WATER HYACINTH
Habit: Perennial herb [annual], generally free-floating. Stem: stout, erect, often connected by stolons. Leaf: +- in basal rosette; blade generally ovate, round or cordate; petiole inflated or not, generally > blade. Inflorescence: spike [panicle, 1-flowered]. Flower: +- bilateral; perianth funnel-shaped, lobes 6; stamens 6, unequal in length; ovary 3-chambered.
Species In Genus: +- 7 species: native to America tropics, perhaps Am subtropics, Africa; some widely naturalized. Etymology: (J.A.F. Eichhorn, Germany, 1779--1856)

Eichhornia crassipes (Mart.) Solms
NATURALIZED
Stem: > 30 cm. Leaf: < 10 cm wide. Inflorescence: 5--15 cm, few- to many-flowered. Flower: perianth lilac or pale blue to white.
Ecology: Locally abundant. Ponds, sloughs, waterways; Elevation: < 200 m. Bioregional Distribution: GV, SnFrB, SCo, PR; Distribution Outside California: widely naturalized, native to tropical America. Flowering Time: Jun--Oct Note: Plants multiply, spread rapidly vegetatively; perhaps world's most troublesome aquatic weed.
eFlora Treatment Author: Charles N. Horn & Elizabeth McClintock
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Noxious Weed

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Citation for this treatment: Charles N. Horn & Elizabeth McClintock 2016. Eichhornia crassipes, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=23856, accessed on February 07, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 07, 2016.


Eichhornia crassipes
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© 2013 Neal Kramer
Eichhornia crassipes
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© 2010 Neal Kramer
Eichhornia crassipes
click for enlargement
© 2013 Neal Kramer
Eichhornia crassipes
click for enlargement
© 2013 Neal Kramer
Eichhornia crassipes
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© 2009 Barry Rice
Eichhornia crassipes
click for enlargement
© 2009 Barry Rice

More photos of Eichhornia crassipes in CalPhotos


Geographic subdivisions for Eichhornia crassipes:
GV, SnFrB, SCo, PR;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.