species: Polygonum perfoliatum
common name: mile-a-minute weed
family: Polygonaceae
where & when encountered: Old Westbury, NY - 2013
Another roadside discovery from the summer of 2013 was this mile-a-minute weed, a fast-growing (as the name suggests) invasive from tropical Asia, possessing distinctively triangular leaves and barbed stems that spread as a vine over other shrubs. Evidently it is popular with certain bugs, who turn the leaves into Swiss cheese.
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