Striate Knotweed
Polygonum achoreum
Striate Knotweed
Mid-Lower Leaf
Regina
18-August-2024
The leaves are elliptic to obovate with a rounded apex, whereas at least some leaves of P. aviculare tend to be more lanceolate. Whitish powdery mildew affects both P. achoreum and P. aviculare, but is usually more prominent on P. achoreum.
Note the pedicels are 1.3-1.8 (2) mm long and enclosed in ocreae, whereas the pedicels of P. aviculare are 1.5-5 mm long and may be enclosed in or exserted from ocreae. The flowers are closed, whereas the flowers of P. aviculare are closed or semi-open.
A key to all species of family Polygonaceae that are found in Alberta,
written by Lorna Allen and Linda Kershaw, is found here.
A key to Saskatchewan species of genus Polygonum, derived from the key in
the Flora of North America, is found here.
 | Polygonaceae: Answers to key questions in Budd's Flora leading to this family. The answers do not all apply to all genera in Polygonaceae, but they all do apply to genus Polygonum.
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