Plate 1 figs. a–e · 3 observations
This species has been photographed under an open licence only 3 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.
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 38 botanical countries
| Region | TDWG code | Continent |
|---|---|---|
| Altay | ALT | ASIA-TEMPERATE |
| Buryatiya | BRY | |
| Chita | CTA | |
| Inner Mongolia | CHI | |
| Iran | IRN | |
| Irkutsk | IRK | |
| Kazakhstan | KAZ | |
| Korea | KOR | |
| Krasnoyarsk | KRA | |
| Manchuria | CHM | |
| Mongolia | MON | |
| North Caucasus | NCS | |
| Tibet | CHT | |
| Transcaucasus | TCS | |
| Türkiye | TUR | |
| Tuva | TVA | |
| West Siberia | WSB | |
| Xinjiang | CHX | |
| Yakutiya | YAK | |
| Albania | ALB | EUROPE |
| Austria | AUT | |
| Bulgaria | BUL | |
| Central European Russia | RUC | |
| East European Russia | RUE | |
| France | FRA | |
| Germany | GER | |
| Greece | GRC | |
| Italy | ITA | |
| North European Russia | RUN | |
| Northwest European Russia | RUW | |
| NW. Balkan Pen. | YUG | |
| Portugal | POR | |
| Romania | ROM | |
| Spain | SPA | |
| Switzerland | SWI | |
| Ukraine | UKR | |
| Pakistan | PAK | ASIA-TROPICAL |
| West Himalaya | WHM |
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.
Where it actually grows measured, from 102 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -26.5 °C | -13.3 °C | -2.5 °C |
| Warmest month, mean daily high | 15.6 °C | 20.0 °C | 25.8 °C |
| Annual rainfall | 314 mm | 976 mm | 1,731 mm |
| Rainfall in the driest quarter | 9 mm | 110 mm | 347 mm |
It is found where winters are arctic. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 102 research-grade observations of Euphrasia hirtella 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.
Also published as 23 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.
- Euphrasia brandisii Freyn & E.Brandis
- Euphrasia carolensis Sennen
- Euphrasia costeana var. ramosa Sennen
- Euphrasia hirtella prol. carolensis Sennen
- Euphrasia hirtella prol. sebastianii Sennen
- Euphrasia hirtella unranked lepida Chabert
- Euphrasia hirtella var. eglandulosa F.Towns. ex Wettst.
- Euphrasia hirtella var. paupera T.Yamaz.
- Euphrasia hirtella var. subglabra F.Towns. ex Gremli
- Euphrasia lepida Chabert
- Euphrasia montana var. hirtella (Jord. ex Reut.) Bouvier
- Euphrasia nemorosa var. pectinata Rchb.
- Euphrasia officinalis f. latifolia (Ledeb.) Regel
- Euphrasia officinalis subsp. capitulata F.Towns.
- Euphrasia officinalis subsp. hirtella (Jord. ex Reut.) Bonnier
- Euphrasia officinalis subvar. polyadena Gren. & H.Roux
- Euphrasia officinalis var. hirtella (Jord. ex Reut.) Krylov
- Euphrasia officinalis var. jabalambrensis Pau ex Rivas Goday & Borja
- Euphrasia officinalis var. latifolia Ledeb.
- Euphrasia polyadena f. elata Sennen
- Euphrasia rostkoviana subsp. hirtella (Jord. ex Reut.) H.Marcailhou & A.Marcailhou
- Euphrasia sebastianii Sennen
- Euphrasia tatarica prol. hirtella (Jord. ex Reut.) Rouy
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.