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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  Armoracia lacustris (A.Gray) Al-Shehbaz & V.M.Bates image
Photographer: William S. Alverson           

William S. Alverson
Family Brassicaceae
Armoracia lacustris (A.Gray) Al-Shehbaz & V.M.Bates
lake cress
Armoracia: Celtic name referring to "saline," favorite habitat of this plant
lacustris: of or pertaining to lakes
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Endangered
Plant: perennial, aquatic forb, hairless; stems partly submersed or floating; fibrous roots along the stems
Flower: white, 4-parted, short stalked, petals rounded at the top
Fruit:inflated, oval pod, 1 seed chamber fruit drawing
Leaf:submersed leaves finely divided into filament-like segments; emergent leaves lance-like to oblong with sharp lobes or toothed edges
Habitat: quiet water, shores, water to 7' deep

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

Flora of North America (off site)
Armoracia aquatica (Eaton) Wiegand
Nasturtium lacustre A.Gray
Neobeckia aquatica (Eaton) Greene
Radicula aquatica (Eaton) B.L.Rob.
Rorippa americana (A.Gray) Britton
Rorippa aquatica (Eaton) E.J.Palmer & Steyerm.

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