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Bistorta
See list of 2 species in this genusThe genus Bistorta is here recognized separate from Persicaria following the phylogenetic work of Kim and Donoghue (2008).
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1a. Inflorescence 3–6 ×0.5–1 cm, bearing sterile flowers in the apical half and bulbils in the basal half (or sometimes bulbils nearly throughout) [Fig. 786]; leaf blades 2–10 cm long, narrowed at the base; plants native, of alpine habitats, at elevations exceeding 1000 m
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1b. Inflorescence 5–9 ×1–2 cm, bearing only fertile flowers; leaf blades 6–20 cm long, rounded to cordate at the base; plants escaped from cultivation
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Each photo represents one species in this genus.