Native Plants

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Zannichellia palustris

Zannichellia palustris L.

Horned Pondweed, Horned Poolmat, Horned-pondweed

Zannichelliaceae (Horned pondweed Family)

Synonym(s): Zannichellia major, Zannichellia palustris var. major, Zannichellia palustris var. stenophylla

USDA Symbol: ZAPA

USDA Native Status: L48 (N), AK (N), CAN (N)

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Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Drupe
Size Notes: Submersed stems up to about 20 inches long.

Bloom Information

Bloom Color: Green , Brown
Bloom Time: Mar , Apr , May , Jun , Jul , Aug
Bloom Notes: Inconspicuous flowers, lacking sepals and petals, are found at the bases of the leaves.

Distribution

USA: AK , AL , AR , AZ , CA , CO , CT , DC , DE , FL , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY
Canada: AB , BC , MB , NB , NL , NS , NT , ON , PE , QC , SK

Growing Conditions

Aquatic: yes

National Wetland Indicator Status

Region:	AGCP	AK	AW	CB	EMP	GP	HI	MW	NCNE	WMVE
Status:	OBL	OBL	OBL		OBL	OBL		OBL	OBL	OBL

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Zannichellia palustris in USDA Plants
FNA: Find Zannichellia palustris in the Flora of North America (if available)
Google: Search Google for Zannichellia palustris

Metadata

Record Modified: 2023-05-25
Research By: TWC Staff

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