Trifolium ochroleucon (sulphur clover)

Plate 1 figs. a–h · 8 separate observations

Trifolium ochroleucon, photographed by Josep Gesti — fig. a Josep Gesti, CC BY-SA 4.0 / 2022-06-04 / obs. 203254516

Trifolium ochroleucon, photographed by CorentinD — fig. c CorentinD, CC BY 4.0 / obs. 201340238

Trifolium ochroleucon, photographed by Edmundas Greimas — fig. d Edmundas Greimas, CC BY 4.0 / obs. 147726757

Trifolium ochroleucon, photographed by Emanuele Santarelli — fig. e Emanuele Santarelli, CC BY-SA 4.0 / obs. 135327111

Trifolium ochroleucon, photographed by Наталья Пикалова — fig. f Наталья Пикалова, CC BY 4.0 / obs. 79158525

Trifolium ochroleucon, photographed by euanmck — fig. g euanmck, CC BY 4.0 / obs. 77237484

Trifolium ochroleucon, photographed by Thomas Koffel — fig. h Thomas Koffel, CC BY 4.0 / obs. 8413351

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 32 botanical countries

Native distribution of Trifolium ochroleucon, 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.

Region	TDWG code	Continent
Albania	ALB	EUROPE
Austria	AUT
Belgium	BGM
Bulgaria	BUL
Corse	COR
Czechia-Slovakia	CZE
France	FRA
Germany	GER
Great Britain	GRB
Greece	GRC
Hungary	HUN
Italy	ITA
Krym	KRY
NW. Balkan Pen.	YUG
Poland	POL
Portugal	POR
Romania	ROM
Sardegna	SAR
Sicilia	SIC
South European Russia	RUS
Spain	SPA
Switzerland	SWI
Türkiye-in-Europe	TUE
Ukraine	UKR
East Aegean Is.	EAI	ASIA-TEMPERATE
Iran	IRN
Lebanon-Syria	LBS
North Caucasus	NCS
Transcaucasus	TCS
Türkiye	TUR
Algeria	ALG	AFRICA
Morocco	MOR

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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 106 in flower of 107 examined

100%

98%

Proportion of examined Trifolium ochroleucon 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	7	7	100%	65% to 100%
Jun	54	54	100%	93% to 100%
Jul	44	45	98%	88% to 100%
Aug	0	0	too few examined
Sep	0	0	too few examined
Oct	1	1	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in May. Each bar is the share of Trifolium ochroleucon 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. 106 of 107 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 9 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.

Also published as 27 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.

Trifolium cassium Boiss.
Trifolium caucasicum Tausch
Trifolium cinerascens Kit.
Trifolium dipsaceum Thuill.
Trifolium marschalii Rouy
Trifolium marschallii Rouy
Trifolium ochroleucon f. roseum (C.Presl) Merino
Trifolium ochroleucon f. villosum Pamp.
Trifolium ochroleucon prol. pallidulum (Jord.) Rouy
Trifolium ochroleucon prol. roseum (C.Presl) Rouy
Trifolium ochroleucon subsp. caucasicum (Tausch) Kožuharov
Trifolium ochroleucon subsp. lamprotrichum H.Lindb.
Trifolium ochroleucon subvar. viciosoanum (Pau) Maire
Trifolium ochroleucon var. abbreviatum Jahand., Maire & Weiller
Trifolium ochroleucon var. brevidentatum Kožuharov
Trifolium ochroleucon var. burnatii Briq.
Trifolium ochroleucon var. grancarovii Kožuharov
Trifolium ochroleucon var. macranthum Kožuharov
Trifolium ochroleucon var. ochroleucon
Trifolium ochroleucon var. pallidulum (Jord.) Asch. & Graebn.
Trifolium ochroleucon var. roseum (C.Presl) Guss.
Trifolium ochroleucum L.
Trifolium pallidulum Jord.
Trifolium roseum C.Presl

and 3 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.
USDA PLANTS Database. common name, checklist symbol TROC6. public domain. Retrieved 2026-07-13.
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.