Bushy Knotweed

Description

“Pet poisonous” – Toxic parts: sap 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 3flowers 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