Polygonum aviculare
 
Doorweed

Leaf Bottom

Highway # 982, Near Intersection With Highway # 9
11-August-2020

Note the ribbed stem and prominent, pinnately arranged secondary leaf veins.  These features (among others) place this species in section Polygonum.

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.

herbs; NOT [shrubs or trees]

land plants; NOT [water plants]

plants not parasitic on trees

plants with more than one pair of leaves; NOT [plants with a single pair of large reniform leaves]

leaves alternate; NOT [leaves opposite]

stipules present

stipules forming a sheath above nodes

flowers perfect