Polygonum runcinatum

Plate 1 figs. a–h · 8 separate observations

Polygonum runcinatum, photographed by George Mitchell — fig. b George Mitchell, CC BY 4.0 / obs. 152073647

Polygonum runcinatum, photographed by Yu-Huang Wang — fig. c Yu-Huang Wang, CC BY 4.0 / obs. 99751393

Polygonum runcinatum, photographed by Jerome Ko — fig. e Jerome Ko, CC BY 4.0 / obs. 40118084

Polygonum runcinatum, photographed by Cheng-Tao Lin — fig. f Cheng-Tao Lin, CC BY 4.0 / obs. 24227579

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 15 botanical countries

Native distribution of Polygonum runcinatum, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.

Region	TDWG code	Continent
Assam	ASS	ASIA-TROPICAL
East Himalaya	EHM
Jawa	JAW
Myanmar	MYA
Nepal	NEP
Philippines	PHI
Sumatera	SUM
Thailand	THA
Vietnam	VIE
West Himalaya	WHM
China North-Central	CHN	ASIA-TEMPERATE
China South-Central	CHC
China Southeast	CHS
Taiwan	TAI
Tibet	CHT

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 45 in flower of 47 examined

92%

100%

Proportion of examined Polygonum runcinatum in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	1	too few examined
Apr	0	0	too few examined
May	2	2	too few examined
Jun	11	12	92%	65% to 99%
Jul	13	13	100%	77% to 100%
Aug	12	12	100%	76% to 100%
Sep	4	4	too few examined
Oct	3	3	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jul. Each bar is the share of Polygonum runcinatum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 45 of 47 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 9 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 6 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

Persicaria morrisonensis (Hayata) Nakai
Persicaria runcinata (Buch.-Ham.) H.Gross
Polygonum morrisonense Hayata
Polygonum panduriforme H.Lév. & Vaniot
Polygonum runcinatum var. exauriculatum Lingelsh.
Polygonum runcinatum var. runcinatum

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.