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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  Alnus viridis (Vill.) DC. subsp. crispa (Aiton) Turrill image
Photographer: Dennis W. Woodland           

Emmet J. Judziewicz

Emmet J. Judziewicz

Family Betulaceae
Alnus viridis (Vill.) DC. subsp. crispa (Aiton) Turrill
American green alder, green alder, mountain alder
Alnus: ancient Latin name derived from the Celtic, "growth along streams"
viridis: viridis for "green"
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: perennial shrub to 12' tall; grayish brown, smooth bark with pale lenticels; alone or in thickets
Flower: winter buds almost stalkless, male catkins 1"-3 1/2" long; blooms in spring
Fruit:oval, stalked fruit clusters
Leaf:leaf oval to elliptic, dark green, leathery, edges finely toothed, somewhat resin-coated
Habitat: moist to wet; streambanks, lakeshores, bog edges or sandy to gravelly slopes or flats

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

Flora of North America (off site)
Alnus alnobetula (Ehrh.) K.Koch var. crispa (Aiton) H.J.P.Winkler
Alnus crispa (Aiton) Pursh
Alnus crispa (Aiton) Pursh var. elongata Raup
Alnus crispa (Aiton) Pursh var. harricanensis Lepage
Alnus crispa (Aiton) Pursh var. mollis (Fernald) Fernald
Alnus crispa (Aiton) Pursh var. stragula Fernald
Alnus mitchelliana M.A.Curtis ex A.Gray
Alnus mollis Fernald
Alnus viridis (Vill.) DC. var. crispa (Aiton) House
Alnus viridis (Vill.) DC. var. fernaldii House
Alnus X hultenii Murai
Betula crispa Aiton
Duschekia viridis (Chaix) Opiz

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