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New leaves of Reynoutria japonica are dark red and 1 to 4 cm (1 ⁄ 2 to 1 + 1 ⁄ 2 in) long; young leaves are green and rolled back with dark red veins; leaves are green and shaped like a heart flattened at the base, or a shield, and are usually around 12 cm (5 in) long. Mature R. japonica forms 2-to-3-metre-tall (6 + 1 ⁄ 2 to 10 ft), dense ...
Fallopia × bohemica → Reynoutria × bohemica, Bohemian knotweed. Fallopia ciliinodis (Michx.) Holub – fringed black bindweed → Polygonum ciliinode; Fallopia denticulata (C.C.Huang) Holub → Pteroxygonum denticulatum; Fallopia japonica Houtt. – Japanese knotweed → Reynoutria japonica; Fallopia sachalinensis – giant knotweed → ...
Reynoutria is a genus of flowering plants in the Polygonaceae, also known as the knotweed or buckwheat family. The genus is native to eastern China, Eastern Asia and the Russian Far East , although species have been introduced to Europe and North America. [ 1 ]
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Japanese knotweed (Reynoutria japonica), native to Asia, is one of the most damaging invasive alien plants in the world. [3] It became her major research focus and led to publication of a groundbreaking analysis of the history and distribution of this invasive weed in 1977. [4]
Reynoutria sachalinensis is a herbaceous perennial plant growing to 2–4 m (79–157 in) tall, with strong, extensively spreading rhizomes forming large clonal colonies. The leaves are some of the largest in the family, up to 15–40 cm (6–15.5 in) long and 10–28 cm (4–11 in) broad, nearly heart-shaped, with a somewhat wavy, crenate margin.
Bohemian knotweed is a nothospecies that is a cross between Japanese knotweed and giant knotweed.It has been documented as occurring in the wild in Japan. [1] The scientific name is accepted to be Reynoutria × bohemica, [2] but it may also be referred to as Fallopia × bohemica and Polygonum × bohemicum.
It includes a number of plants that can be highly invasive, such as Japanese knotweed, Reynoutria japonica, and its hybrid with R. sachalinensis, R. × bohemica. Boundaries between the genera placed in the subfamily and their relationships have long been problematic, but a series of molecular phylogenetic studies have clarified some of them ...