Bushy knotweed (Polygonum ramosissimum prolificum)
Description
Polygonum ramosissimum�has erect stems growing 30 to 100�cm (12 to 39.5�in) (sometimes to 200�cm or 80 inches) tall, with yellowish-green to blue-green foliage. The stems are freely branched with closed flowers produced in groups of 2 to 3 flowers in the upper�ocreae�of racemes that are up to 15�cm (6�in) long, the inflorescences are spike-like. The greenish-yellow, rarely pink or white marked flowers, are on pedicels that are longer than the calyx. The calyx is around 3�mm (0.12�in) long and 5-parted with the outer three sepals longer than the inner sepals. The seeds are produced in fruits called achenes, which are egg-shaped, dark brown and around 3�mm (0.12�in) long. The achenes also have a smooth shiny surface. The late season achenes are larger, from 4 to 15�mm long.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Magnoliopsida
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Order: Caryophyllales
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Family: Polygonaceae
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Genus: Polygonum
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