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Date created
25 Jul 2020
Last revised
19 Jul 2023
Matsuyama, Japan
This herbaceous annual vine in the buckwheat family appears to be missing from the World data bank. Three features make the identification fairly straightforward. The reddish stems are quite spiny; the flower clearly belongs in the Polygonaceae; and the leaves are remarkably triangular in shape. It is native to most of temperate and tropical eastern Asia, and is regarded as a highly invasive weed.
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