Ophiorrhiza japonica

Plate 1 figs. a–h · 8 separate observations

Ophiorrhiza japonica, photographed by chiuluan — fig. b chiuluan, CC BY 4.0 / obs. 179251386

Ophiorrhiza japonica, photographed by Moogoo Lee — fig. c Moogoo Lee, CC BY 4.0 / obs. 171981616

Ophiorrhiza japonica, photographed by Agnes Trekker — fig. e Agnes Trekker, CC0 1.0 / obs. 167072007

Ophiorrhiza japonica, photographed by Jacy Chen — fig. f Jacy Chen, CC BY 4.0 / obs. 129846620

Ophiorrhiza japonica, photographed by Yu-Huang Wang — fig. g Yu-Huang Wang, CC BY 4.0 / obs. 116593027

Ophiorrhiza japonica, photographed by 葉子 — fig. h 葉子, CC0 1.0 / obs. 116778795

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 8 botanical countries

Native distribution of Ophiorrhiza japonica, 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. Regions too small to draw at this scale are marked with a dot.

Region	TDWG code	Continent
China North-Central	CHN	ASIA-TEMPERATE
China South-Central	CHC
China Southeast	CHS
Hainan	CHH
Japan	JAP
Nansei-shoto	NNS
Taiwan	TAI
Vietnam	VIE	ASIA-TROPICAL

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 202 in flower of 225 examined

86%

98%

80%

50%

100%

90%

79%

Proportion of examined Ophiorrhiza japonica in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	31	36	86%	71% to 94%
Feb	47	48	98%	89% to 100%
Mar	45	46	98%	89% to 100%
Apr	32	40	80%	65% to 90%
May	3	6	50%	19% to 81%
Jun	3	3	too few examined
Jul	4	4	too few examined
Aug	2	3	too few examined
Sep	3	3	too few examined
Oct	12	12	100%	76% to 100%
Nov	9	10	90%	60% to 98%
Dec	11	14	79%	52% to 92%

Peak flowering in Oct. Each bar is the share of Ophiorrhiza japonica 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. 202 of 225 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 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 17 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.

Ophiorrhiza acutiloba Hayata
Ophiorrhiza cavaleriei H.Lév.
Ophiorrhiza dimorphantha Hayata
Ophiorrhiza dimorphantha f. brevistigma Hayata
Ophiorrhiza dimorphantha f. longistigma Hayata
Ophiorrhiza eryei Champ.
Ophiorrhiza japonica f. plena T.Yamaz.
Ophiorrhiza japonica var. acutiloba (Hayata) Ohwi
Ophiorrhiza japonica var. amamiana Hatus.
Ophiorrhiza japonica var. minor E.H.L.Krause
Ophiorrhiza japonica var. tashiroi (Maxim.) Ohwi
Ophiorrhiza labordei H.Lév.
Ophiorrhiza monticola Hayata
Ophiorrhiza monticola f. brevistigma Hayata
Ophiorrhiza monticola f. longistigma Hayata
Ophiorrhiza nigricans H.S.Lo
Ophiorrhiza tashiroi Maxim.

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.