Ontario Weeds: Striate knotweed

Table of Contents

1. Name
2. Other Names
3. Family
4. General Description
   • Photos and Pictures
5. Stems and Leaves
6. Habitat
7. Similar Species
8. Related Links

Name: Striate knotweed, Polygonum achoreum Blake.

Other Names: POLAH, renouée coriace, Erect knotweed

Family: Buckwheat or Smartweed Family (Polygonaceae)

General Description: Annual reproducing only by seed.

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Photos and Pictures

Striate knotweed, left. Prostrate knotweed, right.

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Stems & Leaves: Coarser, more erect stems than Prostrate knotweed, and broader and more rounded leaves. Triangular seeds are smooth and olive-coloured. All knotweeds have wiry stems with swollen nodes, membranous ocrea, and tiny flowers arising inside the ocrea in leaf axis.

Habitat: This plant sometimes occurs in similar situations as Prostrate knotweed, especially roadsides.

Similar Species: It is distinguished from Prostrate knotweed by its coarser, more erect stems and broader, more rounded leaves.

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Related Links

... on general Weed topics
... on weed identification, order OMAFRA Publication 505: Ontario Weeds
... on weed control, order OMAFRA Publication 75: Guide To Weed Control

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