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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 December 10, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 10, 2016.


Zannichellia palustris
click for enlargement
© 2009 Neal Kramer
Zannichellia palustris
click for enlargement
© 2010 Neal Kramer
Zannichellia palustris
click for enlargement
© 2009 Neal Kramer
Zannichellia palustris
click for enlargement
© 2010 Neal Kramer
Zannichellia palustris
click for enlargement
© 2015 Neal Kramer
Zannichellia palustris
click for enlargement
© 2015 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. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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.