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

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

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #20526)

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Distribution of Fallopia sachalinensis
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Species Information

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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

Habitat / Range

Mesic fields, roadsides and waste places in the lowland zone; infrequent on Vancouver Island, the Gulf Islands and the Vancouver area, rare on the midcoast (Prince Rupert); introduced from Asia.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Polygonum sachalinense F. Schmidt ex Maxim.
Reynoutria sachalinensis

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References