Polygonum L. (タデ)

Harutade (ハルタデ, 春蓼), lady's thumb, spotted lady's thumb, Jesusplant, and redshank
Lifeform: annual forb
Distribution: cosmopolitan (originally in Eurasia)
Habitat: roadsides, riverbanks, paddy fields, and on fallow grounds
Chromosome number: 2n = 22
Synonyms

Persicaria maculata auct. non (Raf.) A. et D.Love

Persicaria maculosa Gray ssp. hirticaulis (Danser) S.Ekman et T. Knutsson var. pubescens (Makino) Yonek.

Persicaria Mill when established

var. amblyophylla (H. Hara) Yonek. (シラカワタデ)
var. pubescens (Makino) Yonek. (ハルタデ)