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Genus Reynoutria Family Polygonaceae

Description: Rhizomatous perennials with stout erect annual stems; functionally dioecious.

Leaves petiolate, articulate; pit nectaries present; ocrea short-tubular, pale brown, membranous, entire, soon disintegrating.

Flowers functionally unisexual with vestiges of the other sex usually present, clustered, forming axillary panicles. Perianth segments 5, somewhat petaloid, the outer 3 keeled and becoming winged in fruit. Stamens 8; anthers versatile. Style trifid, very short; stigmas shortly elongate, fimbriate.

Achene trigonous, shorter than and enclosed by enlarged perianth.

Photo J. R. Hosking

Other photo
Photo J. R. Hosking


Distribution and occurrence: World: c. 15 species, Asia. Australia: 2 species and one hybrid (naturalized), all present in NSW

Previously included in Fallopia but recent research (e.g. Schuster et al. 2011) indicates their separate status.

Text by K. L. Wilson (1990); edited KL Wilson (Sept 2017)
Taxon concept:

 Key to the species 
1Mature leaves with scattered to dense multicellular hairs to nearly 1 mm long at least along the veins on the undersurface; leaf base strongly cordate, apex acute to acuminate, [15–40 cm long, 7–25 cm wide]; plants 2–5 m highReynoutria sachalinensis
Mature leaves glabrous or with sparse short hairs or minutely roughened on the undersurface; leaf base truncate to slightly cordate, apex cuspidate to acuminate; plants 1.5–5 m high2
2Mature leaves 10–30 cm long, to 18 cm wide, with sparse short hairs or small warty protuberances at least along veins on undersurface; the leaf base slightly cordate, the apex more or less acuminate; plants 2–5 m tallReynoutria x bohemica
Mature leaves 5–15 cm long, 2–12 cm wide, glabrous or minutely roughened on the undersurface; the leaf base more or less truncate, the apex long-acuminate to cuspidate; plants 1.5–3 m high
                       Back to 1
Reynoutria japonica

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