Apocynum cannabinumL.

hemp dogbane

WFO wfo-0000244384 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Apocynum cannabinum, photographed by Chelsea Carroll
fig. a Chelsea Carroll, CC BY 4.0 / 2022-06-11 / obs. 205239893
Apocynum cannabinum, photographed by Kalvin Chan
fig. b Kalvin Chan, CC BY 4.0 / obs. 202799793
Apocynum cannabinum, photographed by Clay Gibbons
fig. c Clay Gibbons, CC BY 4.0 / obs. 205261880
Apocynum cannabinum, photographed by mefisher
fig. d mefisher, CC0 1.0 / obs. 203048220
Apocynum cannabinum, photographed by Yann Kemper
fig. e Yann Kemper, CC0 1.0 / obs. 201715296
Apocynum cannabinum, photographed by Jay Pruett
fig. f Jay Pruett, CC BY 4.0 / obs. 202047909
Apocynum cannabinum, photographed by Ryan Sorrells
fig. g Ryan Sorrells, CC BY 4.0 / obs. 200859060
Apocynum cannabinum, photographed by Samuel A Schmid, PhD, PWS
fig. h Samuel A Schmid, PhD, PWS, CC BY 4.0 / obs. 201129371

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 = 3,298 observations

Peak flowering in Jun, from 3,298 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 93 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.

  • Apocynum album Greene
  • Apocynum angustifolium Wooton
  • Apocynum arenarium Greene
  • Apocynum bebbianum Greene
  • Apocynum bolanderi Greene
  • Apocynum breweri Greene
  • Apocynum canadense Shecut
  • Apocynum cannabinum f. arenarium (F.C.Gates) B.Boivin
  • Apocynum cannabinum f. pennsilvanicum Bég. & Belosersky
  • Apocynum cannabinum f. pubescens (R.Br.) Voss
  • Apocynum cannabinum subsp. cordigerum (Greene) Á.Löve & D.Löve
  • Apocynum cannabinum var. album Bég. & Belosersky
  • Apocynum cannabinum var. album (Greene) F.C.Gates
  • Apocynum cannabinum var. angustifolium (Bég. & Belosersky) N.H.Holmgren
  • Apocynum cannabinum var. bolandri Bég. & Belosersky
  • Apocynum cannabinum var. cannabinum
  • Apocynum cannabinum var. estellinum Bég. & Belosersky
  • Apocynum cannabinum var. floribundum Bég. & Belosersky
  • Apocynum cannabinum var. glaberrimum A.DC.
  • Apocynum cannabinum var. greeneanum (Bég. & Belosersky) Woodson
  • Apocynum cannabinum var. hypericifolium (Aiton) A.Gray
  • Apocynum cannabinum var. incanum Bég. & Belosersky
  • Apocynum cannabinum var. isophyllum (Greene) Bég. & Belosersky
  • Apocynum cannabinum var. lanceolatum Durand & Hilg.

and 69 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.