Botanical name: Bistorta macrophylla Family: Polygonaceae (Knotweed family)
Synonyms: Persicaria macrophylla, Polygonum macrophyllum
Large-Leaf Knotweed is a slender plant with stem simple arising from a woody root stock, with a rounded or oval at branch-ends cluster of pink or red flowers, usually about 1 cm long, borne on a slender erect, nearly leafless stem. Flowers are drooping, about 2 mrn. Leaves are oblong pointed to broadly linear, parallel-sided, up to 2 cm broad but often much narrower, blade 3-12 cm long, with a rounded base; lower leaves are long-stalked; stem mostly 5- 15 cm, but occasionally up to 30 cm. Large-Leaf Knotweed is found in the Himalayas, from Uttarakhand to SW China, at altitudes of 1700-4500 m. Flowering: June-August.
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The flower labeled Large-Leaf Knotweed is ...