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Zannichellia palustris

Higher Taxonomy
Family: ZannichelliaceaeView Description 

Common Name: HORNED-PONDWEED FAMILY
Habit: [Annual] perennial herb from slender, creeping rhizome, glabrous, aquatic, submersed; monoecious. Stem: thread-like, weak. Leaf: alternate to +- whorled, linear; stipules fused to blade or free, sheath-like. Inflorescence: axillary, generally +- cyme, sessile, bract 1, cup-like; staminate flowers below pistillate. Flower: unisexual [bisexual]. Staminate Flower: perianth parts 0 (or 3, minute, scale-like); stamens 1 (or possibly 2--3 but then united, appearing as 1). Pistillate Flower: perianth parts 0; pistils (1)4--5(9), ovaries superior, 1-chambered, 1-ovuled, 1-styled. Fruit: achene-like drupe.
Genera In Family: 4 genera, 10--12 species: +- worldwide.
eFlora Treatment Author: Robert F. Thorne, Robert R. Haynes & C. Barre Hellquist
Scientific Editor: Thomas J. Rosatti.
Genus: ZannichelliaView Description 

Common Name: HORNED-PONDWEED
Habit: Perennial herb. Stem: generally few-branched. Leaf: entire. Inflorescence: staminate flowers generally 1, pistillate 2--4[6], pedicelled in fruit or not. Staminate Flower: stamen 1, filament slender, anther 2--4-chambered. Pistillate Flower: style short, stigma peltate. Fruit: compressed, abaxially curved, ridged, toothed, adaxially +- straight, base stalk-like, tip beaked.
Species In Genus: +- 5 species: +- worldwide. Etymology: (Gian G. Zannichelli, Venetian botanist, 1662--1729)

Zannichellia palustris L.
NATIVE
Stem: 3--10 dm. Leaf: 2--10 cm; blade < 1 mm wide, tip acute. Fruit: 1.7--4 mm; beak 1--1.5 mm. Chromosomes: 2n=12,24,28,32,36.
Ecology: Streams, ponds, lakes; Elevation: < 2200 m. Bioregional Distribution: +- CA (exc possibly KR, SN); Distribution Outside California: +- worldwide. Flowering Time: Mar--Nov
eFlora Treatment Author: Robert F. Thorne, Robert R. Haynes & C. Barre Hellquist
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Citation for this treatment: Robert F. Thorne, Robert R. Haynes & C. Barre Hellquist 2016. Zannichellia palustris, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=48827, accessed on February 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 05, 2016.


Zannichellia palustris
click for enlargement
© 2009 Neal Kramer
Zannichellia palustris
click for enlargement
© 2009 Neal Kramer
Zannichellia palustris
click for enlargement
© 2015 Neal Kramer
Zannichellia palustris
click for enlargement
© 2015 Neal Kramer
Zannichellia palustris
click for enlargement
© 2010 Neal Kramer
Zannichellia palustris
click for enlargement
© 2010 Neal Kramer

More photos of Zannichellia palustris in CalPhotos


Geographic subdivisions for Zannichellia palustris:
+- CA (exc possibly KR, SN);
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.