Polygonum vulcanicumGreene Polygonum glastifoliumGreene Polygonum cephalophorumGreene Polygonum bistortoides var. oblongifolium (Beisn.) St. John Polygonum bistortoides var. linearifolium (S. Wats.) Small Persicaria bistortoides (Pursh) H. Hinds Bistorta vulcanicaGreene Bistorta glastifoliaGreene Bistorta cephalophoraGreene Bistorta bistortoides var. oblongifolia (Meissn.) Moldenke