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.

Please direct any comments to

Thank you.

  Xanthium strumarium L. image
Photographer: Stephen L. Solheim           

Botancial Illustration

Botancial Illustration

Kurt Stüber

Merel R. Black

Merel R. Black

Christopher Noll
Family Asteraceae
Xanthium strumarium L.
common cocklebur, rough cocklebur
Xanthium: from a Greek word meaning "yellow"
strumarium: of or pertaining to tumors or ulcers; rough
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: erect, annual, 8"-18" tall forb
Flower: head green; inflorescence of several heads at the ends of the stem and from the leaf axils; blooms Aug.-Sept.
Fruit:thick, dry seeds clustered in a 1/3" - 1 1/3" oblong bur with heavy, hooked prickles
Leaf:long-stalked, widely oval to kidney-shaped and with a heart-shaped base
Habitat: disturbed sites, fields

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

Flora of North America (off site)
(for list of synonyms - see the varieties)

Botany News/Events
Book We Recommend
Historical Botanists
Other Links
Botanical Club of Wisconsin (off site)
UW-Stevens Point Biology Dept.
Plants of Wisconsin
Vascular Plants
Natural Communities
Botany News/Events
Other Links
Lichens (off site)   
Tom Volk's Fungi (off site)
Taxonomy of Vascular Plants
                          Vascular Plants
Browse by Identification Guides
Family Wildflowers
Genus Trees
Common Names Shrubs
Search by Vines
Names Aquatic-Semi aquatic
Specimens Ferns - Fern Allies
Blooming Times Grasses, Sedges, or Rushes
County & Status Other Resources  
Town Range Taxonomy of Vascular Plants
  WI Checklist & CofC Values
Browse by:
Common Name
Search by:
Copyright © 2012 Permissions Contact Us Web Map