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.

  Polygonum aviculare L. subsp. buxiforme (Small) Costea & Tardif image
Photographer: from USDA Plants website           
Family Polygonaceae
Polygonum aviculare L. subsp. buxiforme (Small) Costea & Tardif
box knotweed, boxwood knotweed
Polygonum: derived from the Greek words polys, "many," and gonu, "knee or joint," hence "many joints" because of the thickened joints on the stem
buxiforme: bux for "box" and forme for "form" or "shape"
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: sprawling to matting annual forb; stems with many branches
Flower: white to pink edges, 5-parted, petals and petal-like sepals joined at the base and hooded, 3 outer longer than other 2; inflorescence small clusters from the leaf axils
Fruit:dark brown, dull, dry seed
Leaf:alternate, flat, oblong, jointed at the base
Habitat: marsh edges, dunes; in sandy soil

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

Flora of North America (off site)
Polygonum aviculare L. var. crassifolium Lange
Polygonum aviculare L. var. littorale (Link) Mert.
Polygonum buxiforme Small
Polygonum littorale Link

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