Clematis drummondiiTorr. & A.Gray

Old Man's Beard Clematis

WFO wfo-0000609861 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Clematis drummondii, photographed by Michelle W. （鍾偉瑋）
fig. a Michelle W. （鍾偉瑋）, CC BY 4.0 / 2022-03-04 / obs. 181634155
Clematis drummondii, photographed by Rachel Stringham
fig. b Rachel Stringham, CC BY 4.0 / obs. 181508136
Clematis drummondii, photographed by Reid Hardin
fig. c Reid Hardin, CC BY 4.0 / obs. 179775445
Clematis drummondii, photographed by Center for Urban Ecology
fig. d Center for Urban Ecology, CC0 1.0 / obs. 168271192
Clematis drummondii, photographed by Reid Hardin
fig. e Reid Hardin, CC BY 4.0 / obs. 161139961
Clematis drummondii, photographed by Reid Hardin
fig. f Reid Hardin, CC BY 4.0 / obs. 161144373
Clematis drummondii, photographed by Sue Ann Kendall
fig. g Sue Ann Kendall, CC BY 4.0 / obs. 158255394
Clematis drummondii, photographed by Catherine C. Galley
fig. h Catherine C. Galley, CC BY 4.0 / obs. 163209113

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 = 841 observations

Peak flowering in Jun, from 841 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 4 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.

  • Clematis caudata Hook. ex Hemsl.
  • Clematis dioica var. drummondii (Torr. & A.Gray) Kuntze
  • Clematis dioica var. nervata (Benth.) Kuntze
  • Clematis nervata Benth.

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.