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ZANNICHELLIACEAE HORNED-PONDWEED FAMILY

Robert F. Thorne, Robert R. Haynes & C. Barre Hellquist

[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.
4 genera, 10–12 species: ± worldwide. [Haynes & Hellquist 2000 FNANM 22:84–85] —Scientific Editor: Thomas J. Rosatti.

ZANNICHELLIA HORNED-PONDWEED
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.
± 5 species: ± worldwide. (G.G. Zannichelli, Venetian botanist, 1662–1729)
Unabridged etymology: (Gian G. Zannichelli, Venetian botanist, 1662–1729)

Z. 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.
2n=12,24,28,32,36. Streams, ponds, lakes; < 2200 m. ± California (except possibly Klamath Ranges, Sierra Nevada); ± worldwide. Mar–Nov [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 23 2014
Citation for this treatment: [Author of taxon treatment] 2013. Zannichellia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=48827, accessed on Nov 23 2014

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click for enlargement Zannichellia palustris
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1995 Saint Mary's College of California

Geographic subdivisions indicated for the distribution of Zannichellia palustris 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.