Corylus cornutaMarshall

beaked hazelnut

WFO wfo-0000925296 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Corylus cornuta, photographed by Ian Manning
fig. a Ian Manning, CC BY 4.0 / 2022-06-12 / obs. 205634013
Corylus cornuta, photographed by Lynn Harper
fig. b Lynn Harper, CC0 1.0 / obs. 203974686
Corylus cornuta, photographed by Mary E. Macaulay, P.Eng.
fig. c Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 202567977
Corylus cornuta, photographed by Mary Krieger
fig. d Mary Krieger, CC BY 4.0 / obs. 195304143
Corylus cornuta, photographed by Mary E. Macaulay, P.Eng.
fig. e Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 202539309
Corylus cornuta, photographed by Lynn Harper
fig. f Lynn Harper, CC0 1.0 / obs. 192583848
Corylus cornuta, photographed by Lynn Harper
fig. g Lynn Harper, CC0 1.0 / obs. 192175420
Corylus cornuta, photographed by Michael Warner
fig. h Michael Warner, CC BY 4.0 / obs. 191106385

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 = 1,033 observations

Peak flowering in Apr, from 1,033 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 18 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.

  • Calycera microphylla Dochnahl
  • Corylus californica (A.DC.) A.Heller
  • Corylus californica (A.DC.) Rose
  • Corylus cornuta Du Roi ex Steud.
  • Corylus cornuta f. glandulosa (B.Boivin) T.C.Brayshaw
  • Corylus cornuta f. inermis Fernald
  • Corylus cornuta var. californica (A.DC.) Sharp.
  • Corylus cornuta var. cornuta
  • Corylus cornuta var. glandulosa B.Boivin
  • Corylus cornuta var. megaphylla Vict. & J.Rousseau
  • Corylus mexicana K.Koch
  • Corylus rostrata Dippel
  • Corylus rostrata Aiton
  • Corylus rostrata var. californica A.DC.
  • Corylus rostrata var. tracyi Jeps.
  • Rostella americana Dochnahl
  • Rostella major Dochnahl
  • Rostella praecox Dochnahl

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.