Robert W. Freckmann Herbarium

  Polygonum aviculare L. image
Photographer: Emmet J. Judziewicz           

Botanical Illustration

Botanical Illustration

Emmet J. Judziewicz
Family Polygonaceae
Polygonum aviculare L.
common knotweed, prostrate 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
aviculare: relating to small birds
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized
Plant: sprawling, annual, 1'-6' long forb; stems with many branches, nodes thin and translucent, becoming jagged
Flower: white to pink-edged, 5-parted, 1/16"-1/8" long, petals and petal-like sepals with flat tips, joined at the base, the outer 3 not longer than the other 2 ; inflorescence small clusters from the leaf axils; blooms Aug.-Oct.
Fruit:dark brown, dull, dry seed
Leaf:alternate, flat, jointed at the base; early leaves lance-like and 3 times as large as the later ones
Habitat: disturbed sites

More Information Natural Communities Herbarium Specimens
All Polygonum list Ethnobotany Information 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