Epithelantha greggii

Plate 1 figs. a–h · 8 separate observations

Epithelantha greggii, photographed by Karla M. Benítez — fig. d Karla M. Benítez, CC BY 4.0 / obs. 99069183

Epithelantha greggii, photographed by Sandino Guerrero — fig. f Sandino Guerrero, CC BY 4.0 / obs. 55101990

Epithelantha greggii, photographed by Leticia Jiménez Hernández — fig. g Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 44335537

Epithelantha greggii, photographed by Rogelio Reyna-Hernández — fig. h Rogelio Reyna-Hernández, CC BY-SA 4.0 / obs. 29708411

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 1 botanical country

Native distribution of Epithelantha greggii, 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.

Region	TDWG code	Continent
Mexico Northeast	MXE	NORTHERN AMERICA

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 234 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	3.4 °C	7.8 °C	8.8 °C
Warmest month, mean daily high	24.3 °C	32.6 °C	34.6 °C
Annual rainfall	220 mm	325 mm	553 mm
Rainfall in the driest quarter	22 mm	39 mm	55 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 234 research-grade observations of Epithelantha greggii 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 13 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.

Cactus micromeris var. greggii (Engelm.) J.M.Coult.
Cephalomamillaria micromeris var. greggii (Engelm.) Frič
Cephalomammillaria greggii (Engelm.) Frič
Cephalomammillaria micromeris var. greggii (Engelm.) Frič
Epithelantha densispina Bravo
Epithelantha micromeris subsp. greggii (Engelm.) N.P.Taylor
Epithelantha micromeris var. densispina (Bravo) Backeb.
Epithelantha micromeris var. greggii (Engelm.) Borg
Epithelantha micromeris var. rufispina (Bravo) Backeb.
Epithelantha petri Halda & Horáček
Epithelantha rufispina Bravo
Mammillaria greggii (Engelm.) Saff.
Mammillaria micromeris var. greggii Engelm.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
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.