*Reynoutria Houttuyn. Subfamily: Polygonoideae. Tribe: Polygoneae. Subtribe: Reynoutriinae.
A genus of about 15 species, perennial herbs, of temperate e. Asia. Ronse Decraene & Akeroyd (1988) and some other recent workers in Polygonaceae treat this group as Fallopia section Reynoutria (Houttuyn) Ronse Decraene, but molecular evidence supports its recognition at genus rank, as a monophyletic genus sister to a clade consisting of Parogonum, Fallopia, and Muehlenbeckia (Desjardins et al. 2023; Schuster, Wilson, & Kron 2011). All four genera could be lumped together as a larger monophyletic genus, but no one has proposed combining the Southern Hemisphere and morphologically discordant Muehlenbeckia with Fallopia, etc.
References: Brandbyge (1993) In Kubitzki, Rohwer, & Bittrich (1993); Desjardins et al. (2023); Freeman & Hinds (2005) In Flora of North America Editorial Committee (2005); Ronse De Craene & Akeroyd (1988); Schuster, Reveal, & Kron (2011); Schuster, Wilson, & Kron (2011); Zika & Jacobson (2003). Show full citations.
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