Helianthemum oelandicum(L.) Dum.Cours.

WFO wfo-1200072869 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Helianthemum oelandicum, photographed by Wolfgang Jauch
fig. a Wolfgang Jauch, CC BY 4.0 / 2021-06-26 / obs. 139064930
Helianthemum oelandicum, photographed by Elias
fig. b Elias, CC BY 4.0 / obs. 139497637
Helianthemum oelandicum, photographed by Wolfgang Jauch
fig. c Wolfgang Jauch, CC BY 4.0 / obs. 86631910
Helianthemum oelandicum, photographed by Philipp Pavelka
fig. d Philipp Pavelka, CC BY 4.0 / obs. 78441754
Helianthemum oelandicum, photographed by Christian Berg
fig. e Christian Berg, CC BY 4.0 / obs. 80086891
Helianthemum oelandicum, photographed by Daniel Ellehammer Larsen
fig. f Daniel Ellehammer Larsen, CC BY 4.0 / obs. 145327202
Helianthemum oelandicum, photographed by carnifex
fig. g carnifex, CC BY 4.0 / obs. 86163678
Helianthemum oelandicum, photographed by Katrin Ellmaier
fig. h Katrin Ellmaier, CC BY 4.0 / obs. 86499412

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.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
05004288
Filed as
Helianthemum oelandicum subsp. orientale (Grosser) M.Proctor
Det. by
not recorded on this sheet
Collected
not recorded
Origin
not recorded
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 26 botanical countries

Regions where Helianthemum oelandicum is native: North Caucasus, Transcaucasus, Türkiye, Albania, Austria, Belarus, Bulgaria, Central European Russia, Czechia-Slovakia, East European Russia, France, Germany, Greece, Ireland, Italy, Krym, North European Russia, NW. Balkan Pen., Poland, Romania, Sicilia, South European Russia, Spain, Sweden, Switzerland, Ukraine North CaucasusTranscaucasusTürkiyeAlbaniaAustriaBelarusBulgariaCentral European RussiaCzechia-SlovakiaEast European RussiaFranceGermanyGreeceIrelandItalyKrymNorth European RussiaNW. Balkan Pen.PolandRomaniaSiciliaSouth European RussiaSpainSwedenSwitzerlandUkraine
Native distribution of Helianthemum oelandicum, 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.
RegionTDWG codeContinent
Albania ALB EUROPE
Austria AUT
Belarus BLR
Bulgaria BUL
Central European Russia RUC
Czechia-Slovakia CZE
East European Russia RUE
France FRA
Germany GER
Greece GRC
Ireland IRE
Italy ITA
Krym KRY
North European Russia RUN
NW. Balkan Pen. YUG
Poland POL
Romania ROM
Sicilia SIC
South European Russia RUS
Spain SPA
Sweden SWE
Switzerland SWI
Ukraine UKR
North Caucasus NCS ASIA-TEMPERATE
Transcaucasus TCS
Türkiye TUR

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 124 in flower of 139 examined

Peak flowering in Jun. Each bar is the share of Helianthemum oelandicum 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. 124 of 139 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 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 479 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -10.4 °C -1.3 °C 3.4 °C
Warmest month, mean daily high 16.8 °C 24.6 °C 29.8 °C
Annual rainfall 544 mm 962 mm 1,715 mm
Rainfall in the driest quarter 78 mm 141 mm 265 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 479 research-grade observations of Helianthemum oelandicum 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 113 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.

  • Cistus alpestris Jacq.
  • Cistus canus var. seguieri L.
  • Cistus italicus L.
  • Cistus oelandicus L.
  • Cistus oelandicus var. canescens Hartm.
  • Cistus oelandicus var. denudatus Hartm.
  • Cistus piloselloides Lapeyr.
  • Cistus seguieri Pourr. ex Dunal
  • Helianthemum allionii Tineo
  • Helianthemum alpestre (Jacq.) DC.
  • Helianthemum alpestre var. italicum (L.) DC.
  • Helianthemum alpestre var. oelandicum DC.
  • Helianthemum alpestre var. rotundifolium (Benth.) Loisel.
  • Helianthemum ambiguum Schur
  • Helianthemum canum f. alpinum (Willk.) Grosser
  • Helianthemum canum f. alpinum Pau
  • Helianthemum canum f. piloselloides (Lapeyr.) Janch.
  • Helianthemum canum subsp. canescens (Hartm.) M.Proctor
  • Helianthemum canum subsp. nebrodense (Heldr. ex Guss.) Arcang.
  • Helianthemum canum subsp. piloselloides (Lapeyr.) M.Proctor
  • Helianthemum canum subsp. pourretii (Timb.-Lagr.) M.Proctor
  • Helianthemum canum subsp. stevenii M.C.F.Proctor
  • Helianthemum canum subsp. stevenii (Rupr. ex Juz. & Pozdeeva) M.Proctor
  • Helianthemum canum var. alpinum (Willk.) Cuatrec.

and 89 more.

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. 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.