Asclepias viridifloraRaf.

green comet milkweed

WFO wfo-0000551883 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Asclepias viridiflora, photographed by Samuel A Schmid, PhD, PWS
fig. a Samuel A Schmid, PhD, PWS, CC BY 4.0 / 2022-05-30 / obs. 201971029
Asclepias viridiflora, photographed by Craig Martin
fig. b Craig Martin, CC0 1.0 / obs. 203660541
Asclepias viridiflora, photographed by Thomas Koffel
fig. c Thomas Koffel, CC BY 4.0 / obs. 204546156
Asclepias viridiflora, photographed by Bonnie Semmling
fig. d Bonnie Semmling, CC BY 4.0 / obs. 202359902
Asclepias viridiflora, photographed by Eric Knight
fig. e Eric Knight, CC BY 4.0 / obs. 158186717
Asclepias viridiflora, photographed by Craig Hensley
fig. f Craig Hensley, CC BY 4.0 / obs. 191985119
Asclepias viridiflora, photographed by Reid Hardin
fig. g Reid Hardin, CC BY 4.0 / obs. 162599003
Asclepias viridiflora, photographed by Eric Knight
fig. h Eric Knight, CC BY 4.0 / obs. 196384543

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 = 998 observations

Peak flowering in Jul, from 998 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 14 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.

  • Acerates bifida Rusby ex A.Gray
  • Acerates ivesii Wooton & Standl.
  • Acerates lanceolata Steud.
  • Acerates viridiflora (Raf.) Eaton
  • Acerates viridiflora var. ivesii Britton
  • Acerates viridiflora var. lanceolata (Torr.) A.Gray
  • Asclepias ivesii (Britton) Wooton & Standl.
  • Asclepias lanceolata E.Ives
  • Asclepias nutans Muhl. ex Steud.
  • Asclepias viridiflora var. lanceolata Torr.
  • Asclepias viridiflora var. pubescenti-tomentosa Hook.
  • Asclepias viridiflora var. viridiflora
  • Gomphocarpus viridiflorus (Raf.) Spreng.
  • Polyotus heterophyllus Nutt.

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.