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4. Reynoutria Houttuyn, Nat. Hist. 2(8): 639. 1777.

虎杖属 hu zhang shu

Description from Flora of China

Herbs perennial, dioecious. Rhizomes thickened. Stems erect, stout, hollow. Leaves simple, alternate, petiolate; leaf blade ovate or ovate-elliptic, margin entire; ocrea oblique. Inflorescence axillary, paniculate. Flowers unisexual. Perianth persistent, 5-parted; outer 3 tepals accrescent and winged on abaxial surface in female flowers. Stamens 8. Styles 3; stigmas fimbriate. Achenes ovoid, trigonous.

One of us (Park) believes that this group should be included within the genus Fallopia (see Ronse Decraene & Akeroyd, Bot. J. Linn. Soc. 98: 321–371. 1988; and Bailey & Stace, Pl. Syst. Evol. 180: 29–52. 1992).

The hybrid Reynoutria japonica × R. sachalinensis (R. ×bohemica) is probably cultivated and probably also escaped in China.

About two species: Asia; one species in China.

(Authors: Li Anjen (李安仁 Li An-ren); Chong-wook Park)


 

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