Plate 1 figs. a–h · 8 separate observations
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 6 botanical countries
| Region | TDWG code | Continent |
|---|---|---|
| New South Wales | NSW | AUSTRALASIA |
| Queensland | QLD | |
| South Australia | SOA | |
| Tasmania | TAS | |
| Victoria | VIC | |
| Western Australia | WAU |
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 314 in flower of 322 examined
Peak flowering in Jan. Each bar is the share of Euphrasia collina 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. 314 of 322 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 2 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 677 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -7.4 °C | -2.2 °C | 11.0 °C |
| Warmest month, mean daily high | 14.9 °C | 18.8 °C | 27.6 °C |
| Annual rainfall | 508 mm | 1,084 mm | 1,801 mm |
| Rainfall in the driest quarter | 57 mm | 196 mm | 316 mm |
It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 677 research-grade observations of Euphrasia collina 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 26 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 alpina R.Br.
- Euphrasia alpina var. angustifolia Benth.
- Euphrasia alpina var. humilis Benth.
- Euphrasia brownii F.Muell.
- Euphrasia brownii var. alpina Rodway
- Euphrasia brownii var. collina (R.Br.) Maiden & Betche
- Euphrasia brownii var. paludosa (R.Br.) Maiden & Betche
- Euphrasia brownii var. speciosa (R.Br.) Maiden & Betche
- Euphrasia collina var. alpina Ewart
- Euphrasia collina var. paludosa (R.Br.) Benth.
- Euphrasia collina var. speciosa (R.Br.) Ewart
- Euphrasia collina var. typica Ewart
- Euphrasia deflexifolia Gand.
- Euphrasia diemenica Spreng.
- Euphrasia glacialis Wettst.
- Euphrasia gunnii Du Rietz
- Euphrasia gunnii subsp. deflexifolia (Gand.) W.R.Barker
- Euphrasia muelleri Wettst.
- Euphrasia multicaulis Benth.
- Euphrasia paludosa R.Br.
- Euphrasia paludosa var. pedicularoides Benth.
- Euphrasia speciosa R.Br.
- Euphrasia speciosa var. alba Guilf.
- Euphrasia tasmanica Gand.
and 2 more.
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.