Trifolium campestre (hop trefoil)

Plate 1 figs. a–h

Trifolium campestre, photographed by WATANABE Hitoshi 渡辺仁 — fig. a WATANABE Hitoshi 渡辺仁, CC BY 4.0 / 2022-06-12 / obs. 205389461

Trifolium campestre, photographed by Violet T. — fig. b Violet T., CC BY 4.0 / obs. 204476202

Trifolium campestre, photographed by Rafael Medina — fig. c Rafael Medina, CC BY 4.0 / obs. 205974124

Trifolium campestre, photographed by Pavel Kacl — fig. e Pavel Kacl, CC BY 4.0 / obs. 205822293

Trifolium campestre, photographed by Piermario Maculan — fig. f Piermario Maculan, CC0 1.0 / obs. 205607138

Trifolium campestre, photographed by Zoltán Stekkelpak — fig. g Zoltán Stekkelpak, CC0 1.0 / obs. 203461656

Trifolium campestre, photographed by nigelsymington — fig. h nigelsymington, CC BY 4.0 / obs. 204099969

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.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Trifolium aureumthis one called it 3x compare

Flowering n = 4,365 observations

287

868

1286

897

467

129

146

Flowering observations of Trifolium campestre by month
Month	Observations
Jan	21
Feb	45
Mar	287
Apr	868
May	1286
Jun	897
Jul	467
Aug	129
Sep	97
Oct	146
Nov	94
Dec	28

Peak flowering in May, from 4,365 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 68 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.

Amarenus aureus Fourr.
Amarenus campestris (Schreb.) Fourr.
Amarenus procumbens (L.) Fourr.
Amarenus schreberi Fourr.
Chrysaspis agraria Greene
Chrysaspis campestre Desv.
Chrysaspis campestris (Schreb.) Desv.
Chrysaspis campestris subsp. paphia (Meikle) Chrtek & B.Slavík
Chrysaspis karatavica (Pavlov) Roskov
Chrysaspis procumbens (L.) Desv.
Chrysaspis procumbens (L.) Greene
Melilotus agrarius Desf.
Melilotus lupulinus Lam.
Trifolium agrarium var. nanum Fr.
Trifolium agrarium var. subsessile Boiss.
Trifolium agrarium var. thionanthum (Hausskn.) Hausskn.
Trifolium campestre f. dubium (A.Kern. ex Menyh.) Soó
Trifolium campestre f. nanum (Ser.) C.Vicioso
Trifolium campestre f. pascuarum (Menyh.) Soó
Trifolium campestre f. patule-pilosum H.Lindb.
Trifolium campestre f. patulepilosum H.Lindb.
Trifolium campestre f. patulipilosum H.Lindb.
Trifolium campestre subsp. lagrangei (Boiss.) M.Keskin
Trifolium campestre var. agrariiforme Dumort.

and 44 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.

We publish what we can source and we say so when we cannot. This page has no care advice, no toxicity claim and no native range, because we do not yet have those from a source we can cite.