Noccaea rotundifolia

Plate 1 figs. a–h · 8 separate observations

Noccaea rotundifolia, photographed by Ben Costamagna — fig. c Ben Costamagna, CC BY 4.0 / obs. 140705102

Noccaea rotundifolia, photographed by agujaceratops — fig. d agujaceratops, CC BY 4.0 / obs. 140981622

Noccaea rotundifolia, photographed by Elias — fig. f Elias, CC BY 4.0 / obs. 172214247

Noccaea rotundifolia, photographed by Felicia Seichter — fig. g Felicia Seichter, CC BY 4.0 / obs. 95594456

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

Native distribution of Noccaea rotundifolia, 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
Austria	AUT	EUROPE
France	FRA
Germany	GER
Italy	ITA
NW. Balkan Pen.	YUG
Switzerland	SWI

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 166 in flower of 196 examined

89%

97%

90%

57%

Proportion of examined Noccaea rotundifolia 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	0	too few examined
Apr	0	0	too few examined
May	8	9	89%	56% to 98%
Jun	62	64	97%	89% to 99%
Jul	70	78	90%	81% to 95%
Aug	23	40	57%	42% to 71%
Sep	1	3	too few examined
Oct	2	2	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jun. Each bar is the share of Noccaea rotundifolia 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. 166 of 196 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 8 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 795 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-20.2 °C	-16.4 °C	-12.3 °C
Warmest month, mean daily high	10.3 °C	12.9 °C	16.5 °C
Annual rainfall	1,217 mm	1,792 mm	2,887 mm
Rainfall in the driest quarter	151 mm	297 mm	558 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 795 research-grade observations of Noccaea rotundifolia 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 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.

Crucifera rotundifolia E.H.L.Krause
Hutchinsia rotundifolia W.T.Aiton
Iberidella rotundifolia Hook.f.
Iberis repens Lam.
Iberis rotundifolia L.
Lepidium rotundifolium All.
Noccaea rotundifolia subsp. grignensis F.K.Mey.
Noccaea rotundifolia subsp. intermedia F.K.Mey.
Thlaspi cepaeifolium subsp. cepaeifolium
Thlaspi cepaeifolium subsp. grignense (F.K.Mey.) Greuter & Burdet
Thlaspi cepaeifolium subsp. rotundifolium (L.) Greuter & Burdet
Thlaspi grignense (F.K.Mey.) Landolt
Thlaspi lereschianum Rouy & Foucaud
Thlaspi repens Maire
Thlaspi rotundifolium Gaudin
Thlaspi rotundifolium subsp. grignense (F.K.Mey.) Greuter & Burdet
Thlaspi rotundifolium subsp. rotundifolium

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.