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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  Asclepias tuberosa L. subsp. interior Woodson image
Photographer: Paul E. Berry           

Damon A. Smith

Derek Anderson

Matthew L. Wagner

Matthew L. Wagner

Merel R. Black

Merel R. Black

Marion Sheehan

Christopher Noll

Paul Drobot

Paul Drobot

Robert Bierman

Janice Stiefel
Family Asclepiadaceae
Asclepias tuberosa L. subsp. interior Woodson
butterfly milkweed, butterfly-weed, orange milkweed
Asclepias: named for the Greek god of healing Asklepios
tuberosa: Latin tuberous, alluding to the fact that the rhizomes of some species have tubers
Hazardous hazard symbol- click for definition
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: weakly-erect perennial, 1'-3' tall forb; juice not milky; stems coarsely hairy, single or with many upper branches
Flower: orange to yellow, 5-parted, 3/8"-2/3" tall; inflorescence usually several, erect umbels; blooms July-Sept.
Fruit:pods with many seeds on silky hairs
Leaf:many, alternate (opposite on the branches), linear to lance-like, usually widest below the middle, tapering gradually to the tip
Habitat: full sun; dry to moderate moisture; inland sands, prairies, woods; in sandy, loamy soil

More Information Natural Communities Herbarium Specimens
All Asclepias list Ethnobotany Information Google- Images or Text
Asclepias tuberosa L. subsp. terminalis Woodson
Asclepias tuberosa L. var. interior (Woodson) Shinners

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