Euphorbia macropus(Klotzsch & Garcke) Boiss.

Huachuca Mountain spurge

WFO wfo-0000963177 Accepted WFO 2026-06 8 photographs CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Euphorbia macropus, photographed by Leticia Jiménez Hernández
fig. a Leticia Jiménez Hernández, CC BY-SA 4.0 / 2021-06-23 / obs. 138548790
Euphorbia macropus, photographed by Leticia Jiménez Hernández
fig. b Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 137000680
Euphorbia macropus, photographed by Leticia Jiménez Hernández
fig. c Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 86820535
Euphorbia macropus, photographed by Leticia Jiménez Hernández
fig. d Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 22518055
Euphorbia macropus, photographed by Leticia Jiménez Hernández
fig. e Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 21071418
Euphorbia macropus, photographed by José Belem Hernández Díaz
fig. f José Belem Hernández Díaz, CC BY 4.0 / obs. 9284708
Euphorbia macropus, photographed by Carlos Martorell
fig. g Carlos Martorell, CC BY 4.0 / obs. 1010975
Euphorbia macropus, photographed by Carlos Martorell
fig. h Carlos Martorell, CC BY 4.0 / obs. 405900

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.

Native range 9 botanical countries

Regions where Euphorbia macropus is native: Arizona, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Guatemala, Honduras ArizonaMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestGuatemalaHonduras
Native distribution of Euphorbia macropus, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Arizona ARI NORTHERN AMERICA
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
Guatemala GUA SOUTHERN AMERICA
Honduras HON

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Where it actually grows measured, from 76 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 0.1 °C 5.2 °C 8.3 °C
Warmest month, mean daily high 21.8 °C 25.0 °C 30.2 °C
Annual rainfall 505 mm 694 mm 1,631 mm
Rainfall in the driest quarter 19 mm 33 mm 62 mm

It is found where winters are cool but frost is light or absent. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 76 research-grade observations of Euphorbia macropus that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 9 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.

  • Anisophyllum crassipes Klotzsch & Garcke
  • Anisophyllum macropus Klotzsch & Garcke
  • Eumecanthus tener Millsp.
  • Eumecanthus tenerus Millsp.
  • Euphorbia biformis S.Watson
  • Euphorbia plummerae S.Watson
  • Euphorbia retroscabra S.Watson
  • Euphorbia tenera S.Watson
  • Zygophyllidum biforme (S.Watson) Arthur

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.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.