Corylus avellanaL.

common hazel

WFO wfo-0000925259 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Corylus avellana, photographed by S.R.
fig. a S.R., CC BY 4.0 / 2022-06-12 / obs. 205511373
Corylus avellana, photographed by Марина Садыкова
fig. b Марина Садыкова, CC BY 4.0 / obs. 205690540
Corylus avellana, photographed by Andrew Skotnicki
fig. c Andrew Skotnicki, CC BY 4.0 / obs. 205864964
Corylus avellana, photographed by Jens Ullenius
fig. d Jens Ullenius, CC0 1.0 / obs. 205999427
Corylus avellana, photographed by aga_l_
fig. e aga_l_, CC BY 4.0 / obs. 205231361
Corylus avellana, photographed by Марина Садыкова
fig. f Марина Садыкова, CC BY 4.0 / obs. 203246736
Corylus avellana, photographed by Corinne Benavides
fig. g Corinne Benavides, CC BY 4.0 / obs. 202832581
Corylus avellana, photographed by Zeke Marshall
fig. h Zeke Marshall, CC BY 4.0 / obs. 203263452

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.

Flowering n = 3,563 observations

Peak flowering in Feb, from 3,563 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 144 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.

  • Corylus alba Aiton ex Steud.
  • Corylus algeriensis Oct.Thomas
  • Corylus arborea Steud.
  • Corylus ardua (Poit. & Turpin) Poit. & Turpin
  • Corylus avellana f. atropurpurea Petz. & G.Kirchn.
  • Corylus avellana f. aurea (G.Kirchn.) Dippel
  • Corylus avellana f. aurea Petz. & G.Kirchn.
  • Corylus avellana f. contorta (Bean) Rehder
  • Corylus avellana f. fuscorubra Dippel
  • Corylus avellana f. grandifolia Zapał.
  • Corylus avellana f. grandis (Aiton) Lam.
  • Corylus avellana f. heterophylla (Loudon) Rehder
  • Corylus avellana f. laciniata (Burchardt) Döll
  • Corylus avellana f. laciniata Petz. & G.Kirchn.
  • Corylus avellana f. microphylla Gajic & Korac
  • Corylus avellana f. monstrosa H.Lindb.
  • Corylus avellana f. monstrosa Henriksson
  • Corylus avellana f. peltata Buser
  • Corylus avellana f. peltata De Langhe
  • Corylus avellana f. pendula (Nestel) Dippel
  • Corylus avellana f. variegata (A.DC.) Dippel
  • Corylus avellana subsp. memorabilis (Sennen) Sennen
  • Corylus avellana subsp. sylvestris Ehrh.
  • Corylus avellana unranked aurea (G.Kirchn.) Van Geert

and 120 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.

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.