Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Najas marina L. image
Photographer: Paul Skawinski           

Andrew Hipp

Kurt Stüber

Paul Skawinski
Family Najadaceae
Najas marina L.
alkaline water-nymph, spiny naiad
Najas: from Greek Naias, a water nymph
marina: near sea
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized
Plant: submerged annual, dioecious aquatic; stems very long, many branches, 0.5-4mm thick, often prickly; slight rootstock
Flower: tiny, from leaf axis
Fruit:red-brown, paper-thin walls, irregular pits
Leaf:very narrow, to 2"L x 2W, coarsely toothed edges, lower side of mid-vein prickly
Habitat: wet; clear 3' or more deep-water alkaline water

More Information Natural Communities Herbarium Specimens
All Najas list Google- Images or Text

Flora of North America (off site)
Najas gracilis (Morong) Small
Najas major All.
Najas major All. var. angustifolia A.Braun ex K.Schum.
Najas marina L. var. recurvata Dudley

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