Mitella nudaL.

naked miterwort

WFO wfo-0001135373 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Mitella nuda, photographed by Mary Krieger
fig. a Mary Krieger, CC BY 4.0 / 2022-06-10 / obs. 205031182
Mitella nuda, photographed by Katherine Baird
fig. b Katherine Baird, CC BY 4.0 / obs. 187772615
Mitella nuda, photographed by Mary E. Macaulay, P.Eng.
fig. c Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 171786672
Mitella nuda, photographed by Mary Krieger
fig. d Mary Krieger, CC BY 4.0 / obs. 166581339
Mitella nuda, photographed by Mary Krieger
fig. e Mary Krieger, CC BY 4.0 / obs. 164147430
Mitella nuda, photographed by Steven Lamonde
fig. f Steven Lamonde, CC BY 4.0 / obs. 160411977
Mitella nuda, photographed by Pierre Cartier
fig. g Pierre Cartier, CC0 1.0 / obs. 157168788
Mitella nuda, photographed by Mary Krieger
fig. h Mary Krieger, CC BY 4.0 / obs. 157617396

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 44 botanical countries

Regions where Mitella nuda is native: Amur, Buryatiya, Chita, Inner Mongolia, Irkutsk, Japan, Khabarovsk, Korea, Krasnoyarsk, Manchuria, Mongolia, Primorye, West Siberia, Yakutiya, Alaska, Alberta, British Columbia, Connecticut, Idaho, Iowa, Labrador, Maine, Manitoba, Massachusetts, Michigan, Minnesota, Montana, New Brunswick, New Hampshire, New York, Newfoundland, North Dakota, Northwest Territories, Nova Scotia, Nunavut, Ontario, Pennsylvania, Prince Edward I., Québec, Saskatchewan, Vermont, Washington, Wisconsin, Yukon AmurBuryatiyaChitaInner MongoliaIrkutskJapanKhabarovskKrasnoyarskManchuriaMongoliaPrimoryeWest SiberiaYakutiyaAlaskaAlbertaBritish ColumbiaConnecticutIdahoIowaLabradorMaineManitobaMassachusettsMichiganMinnesotaMontanaNew BrunswickNew HampshireNew YorkNewfoundlandNorth DakotaNorthwest TerritoriesNova ScotiaNunavutOntarioPennsylvaniaPrince Edward I.QuébecSaskatchewanVermontWashingtonWisconsinYukon Korea
Native distribution of Mitella nuda, 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.
RegionTDWG codeContinent
Alaska ASK NORTHERN AMERICA
Alberta ABT
British Columbia BRC
Connecticut CNT
Idaho IDA
Iowa IOW
Labrador LAB
Maine MAI
Manitoba MAN
Massachusetts MAS
Michigan MIC
Minnesota MIN
Montana MNT
New Brunswick NBR
New Hampshire NWH
New York NWY
Newfoundland NFL
North Dakota NDA
Northwest Territories NWT
Nova Scotia NSC
Nunavut NUN
Ontario ONT
Pennsylvania PEN
Prince Edward I. PEI
Québec QUE
Saskatchewan SAS
Vermont VER
Washington WAS
Wisconsin WIS
Yukon YUK
Amur AMU ASIA-TEMPERATE
Buryatiya BRY
Chita CTA
Inner Mongolia CHI
Irkutsk IRK
Japan JAP
Khabarovsk KHA
Korea KOR
Krasnoyarsk KRA
Manchuria CHM
Mongolia MON
Primorye PRM
West Siberia WSB
Yakutiya YAK

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 309 in flower of 630 examined

Peak flowering in Jun. Each bar is the share of Mitella nuda 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. 309 of 630 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.

Where it actually grows measured, from 1,958 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -22.5 °C -14.3 °C -9.5 °C
Warmest month, mean daily high 18.8 °C 22.5 °C 26.0 °C
Annual rainfall 447 mm 730 mm 1,402 mm
Rainfall in the driest quarter 48 mm 83 mm 285 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,958 research-grade observations of Mitella nuda that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 7 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.

  • Mitella cordifolia Lam.
  • Mitella nuda f. countrymaniae F.Seym.
  • Mitella nuda f. intermedia Rosend.
  • Mitella nuda f. prostrata Rosend.
  • Mitella prostrata Michx.
  • Mitella reniformis Lam.
  • Tiarella unifolia Retz.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. 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.