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
(Glossary)

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

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

         
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