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.

  Diodia teres Walter image
Photographer: Emmet J. Judziewicz           

Botancial Illustration

Emmet J. Judziewicz

Robert H. Read
Family Rubiaceae
Diodia teres Walter
button-weed, poor-Joe
Diodia: from the Greek for thoroughfare, from this plants habitats
teres: cylindrical, circular in cross-section
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Special Concern
Plant: erect to sprawling, annual, 8"-32" tall forb
Flower: white to pale purple, 4-parted, 1/4" long, funnel-shaped, stalkless; solitary from the upper leaf axils; blooms July-Sept.
Fruit:dry, hairy, roundish, splitting into 2 nutlets
Leaf:linear to lance-like, opposite, stalkless, stiff, rough
Habitat: dry; in sandy soil, usually on large river floodplains

More Information Natural Communities Herbarium Specimens
All Diodia list Google- Images or Text
Diodella teres (Walter) Small
Diodia teres Walter var. setifera Fernald & Griscom
Diodia teres Walter var. teres

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