E-Flora BC: Electronic Atlas of the Flora of BC

Reynoutria sachalinensis (F. Schmidt ) Ronse Decraene
giant knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

General:
Perennial herb from a rhizome; stems erect, numerous, branched, 2-4 m tall, reddish, hollow.

Leaves:
Basal leaves lacking; stem leaves alternate, 10-30 cm long, the blades widely egg-shaped, the bases heart-shaped, the tips gradually tapered, long stalked; stipules tubular, entire.

Flowers:
Flowers in small axillary panicles; perianths 2-3 mm long, pale green or greenish-white, unequally 5-lobed, the outer lobes strongly winged.

Fruits:
Achenes, 3-angled, about 3 mm long, black, smooth and shiny.

Source: The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source: The Illustrated Flora of British Columbia

Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Exotic	SNA	Exotic	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer.

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Status Information click to expand contents

Synonyms click to expand contents

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