109. Truellum japonicum Houtt.,

Nat. Hist. II(8): Aanwyz. Plaat. [2], 427, fig. 48, tab. 1. 1777.

Lectotypus (designated here by Wijnands): JAPAN: Thunberg s.n. (G-PREL [G00818086]!; isolecto-: UPS- THUNB n° 9714 image seen).

= Polygonum senticosum (Meisn.) Franch. & Sav., Enum. Pl. Jap. 1: 401. 1875.

Notes. – The genus Truellum Houtt. is currently considered a synonym of Polygonum L. Original material of Truellum japonicum is present in the Japan herbarium in G-PREL. This collection is a good match for the plate and is designated here as the lectotype. A duplicate is present in UPS-THUNB.