Robert W. Freckmann Herbarium


  Polygonum achoreum S.F.Blake image
Photographer: Emmet J. Judziewicz           

Emmet J. Judziewicz
Family Polygonaceae
Polygonum achoreum S.F.Blake
beak-seeded knotweed, leathery 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
achoreum: without a native land
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect to sprawling, annual, up to 20" long forb; stems branched, nodes becoming brownish and cut
Flower: yellow to green, 5-parted, 1/8" long, urn-shaped, petals and petal-like sepals joined at the base; inflorescence small clusters from the leaf axils
Fruit:yellow to tan, dry seed
Leaf:alternate, bluish-green, small, flat, narrow, oval to elliptical with a rounded tip, jointed at the base
Habitat: disturbed sites
(Glossary)

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

Flora of North America (off site)
Synonyms 
Polygonum erectum L. subsp. achoreum (S.F.Blake) A.Löve & D.Löve

         
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