Acmispon americanus(Nutt.) Rydb.

Spanish clover

WFO wfo-0000170825 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Acmispon americanus, photographed by Vasily Reinkymov
fig. a Vasily Reinkymov, CC0 1.0 / 2022-05-29 / obs. 201735786
Acmispon americanus, photographed by Cricket Raspet
fig. b Cricket Raspet, CC BY 4.0 / obs. 197976153
Acmispon americanus, photographed by Shane Johnson
fig. c Shane Johnson, CC0 1.0 / obs. 199509303
Acmispon americanus, photographed by George Williams
fig. d George Williams, CC BY 4.0 / obs. 198101213
Acmispon americanus, photographed by Tim Messick
fig. e Tim Messick, CC BY 4.0 / obs. 198175785
Acmispon americanus, photographed by Millie Basden
fig. f Millie Basden, CC BY 4.0 / obs. 194327253
Acmispon americanus, photographed by Jamie Griffiths
fig. g Jamie Griffiths, CC BY 4.0 / obs. 160425691
Acmispon americanus, photographed by Cricket Raspet
fig. h Cricket Raspet, CC BY 4.0 / obs. 172217256

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 = 1,391 observations

Peak flowering in Jul, from 1,391 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 42 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.

  • Acmispon aestivalis A.Heller
  • Acmispon americanum (Nutt.) Rydb.
  • Acmispon elatus (Nutt.) Rydb.
  • Acmispon floribundus (Nutt.) A.Heller
  • Acmispon glabratus A.Heller
  • Acmispon gracilis A.Heller
  • Acmispon helleri (Britton) A.Heller
  • Acmispon helleri (Britton) Small
  • Acmispon multiflorum Raf.
  • Acmispon pilosus (Nutt.) A.Heller
  • Acmispon sericeus Raf.
  • Acmispon sparsiflorus A.Heller
  • Hosackia americana (Nutt.) Piper
  • Hosackia americana subsp. pilosa (Nutt.) Piper
  • Hosackia americana var. glabra (Nutt.) G.S.Torr.
  • Hosackia americana var. pilosa (Nutt.) Piper
  • Hosackia elata Nutt.
  • Hosackia elata var. glabra Nutt.
  • Hosackia floribunda Nutt.
  • Hosackia helleri (Britton) Brand
  • Hosackia helleri (Britton) H.L.Blomq. & Oosting
  • Hosackia mollis Nutt.
  • Hosackia pilosa Nutt.
  • Hosackia purshiana Benth.

and 18 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.