Robert W. Freckmann Herbarium


  Polygonum aviculare L. subsp. depressum (Meisn.) Arcang. image
Photographer: Janice Stiefel           

Emmet J. Judziewicz

Robert R. Kowal

Janice Stiefel
Family Polygonaceae
Polygonum aviculare L. subsp. depressum (Meisn.) Arcang.
door-yard knotweed, oval-leaved 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: matting, annual forb; stems with many branches, nodes 2-parted and becoming jagged
Flower: white to pink-edged, 5-parted, petals and petal-like sepals joined at base, with flat or rounded tips, outer 3 not longer than the other 2; inflorescence small clusters from the leaf axils
Fruit:dark brown, dull, dry seed
Leaf:alternate, bluish-green, all alike, mostly 2-5 times as long as wide, bases jointed
Habitat: disturbed sites, sidewalks, streets
(Glossary)

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

Flora of North America (off site)
Synonyms 
Polygonum aequale Lindm.
Polygonum arenastrum Boreau
Polygonum aviculare L. var. arenastrum (Boreau) Rouy
Polygonum montereyense Brenckle

         
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