Lady's thumb

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Polygonum persicaria L.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

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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

Persicaria maculosa Gray
ssp. hirticaulis (Danser) S. Ekman et T. Knutsson (ハルタデ, s.l.)

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

ssp. maculosa (ヨウシュハルタデ)

Polygonum persicaria in Japan

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[1/2] near JR Sakuragi Station, Yokohama, on January 21 2014. [3] in a patch of wasteland beside the JA Nakasatsunai farmers' market, Hokkaido, on June 25 2026.