Notholithocarpus densiflorus(Hook. & Arn.) Manos, Cannon & S.H.Oh

Tanoak

WFO wfo-0000913528 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Notholithocarpus densiflorus, photographed by velodrome
fig. a velodrome, CC BY 4.0 / 2022-05-22 / obs. 200271495
Notholithocarpus densiflorus, photographed by rappman
fig. b rappman, CC BY 4.0 / obs. 202065117
Notholithocarpus densiflorus, photographed by Amthinkia
fig. c Amthinkia, CC0 1.0 / obs. 181243813
Notholithocarpus densiflorus, photographed by P Holroyd
fig. d P Holroyd, CC BY 4.0 / obs. 191464554
Notholithocarpus densiflorus, photographed by Drew Meyer
fig. e Drew Meyer, CC0 1.0 / obs. 181936683
Notholithocarpus densiflorus, photographed by Drew Meyer
fig. f Drew Meyer, CC0 1.0 / obs. 180199813
Notholithocarpus densiflorus, photographed by Neal Kelso
fig. g Neal Kelso, CC BY 4.0 / obs. 184724479
Notholithocarpus densiflorus, photographed by Theo Summer
fig. h Theo Summer, CC0 1.0 / obs. 184953424

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.

Flowering n = 149 observations

Peak flowering in Jul, from 149 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 16 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.

  • Lithocarpus densiflorus (Hook. & Arn.) Rehder
  • Lithocarpus densiflorus f. lanceolatus (Jeps.) Rehder
  • Lithocarpus densiflorus subsp. echinoides (R.Br.) A.E.Murray
  • Lithocarpus densiflorus var. echinoides (R.Br.ter) Abrams
  • Lithocarpus densiflorus var. montanus (Mayr) Rehder
  • Lithocarpus densiflorus var. parvus Hoover
  • Pasania densiflora (Hook. & Arn.) Oerst.
  • Pasania densiflora f. lanceolata Jeps.
  • Quercus densiflora Hook. & Arn.
  • Quercus densiflora var. echinoides (R.Br.ter) Sarg.
  • Quercus densiflora var. hartwegii A.DC.
  • Quercus densiflora var. montana Mayr
  • Quercus echinacea Torr.
  • Quercus echinata Kotschy ex A.DC.
  • Quercus echinoides R.Br.ter
  • Synaedrys densiflora (Hook. & Arn.) Koidz.

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.