Argemone grandiflora

Plate 1 figs. a–h · 8 separate observations

Argemone grandiflora, photographed by José Belem Hernández Díaz — fig. b José Belem Hernández Díaz, CC BY 4.0 / obs. 136662021

Argemone grandiflora, photographed by Francisco Farriols Sarabia — fig. c Francisco Farriols Sarabia, CC BY 4.0 / obs. 3132251

Argemone grandiflora, photographed by Juan Cruzado Cortés — fig. d Juan Cruzado Cortés, CC BY-SA 4.0 / obs. 3116649

Argemone grandiflora, photographed by Martín Márquez — fig. g Martín Márquez, CC BY 4.0 / obs. 36421869

Argemone grandiflora, photographed by Ricardo Olivo Rodríguez — fig. h Ricardo Olivo Rodríguez, CC BY-SA 4.0 / obs. 189550155

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 3 botanical countries

Native distribution of Argemone grandiflora, 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 Gulf	MXG	NORTHERN AMERICA
Mexico Northeast	MXE
Mexico Northwest	MXN

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 108 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	4.2 °C	9.6 °C	13.5 °C
Warmest month, mean daily high	24.3 °C	30.4 °C	35.6 °C
Annual rainfall	424 mm	626 mm	957 mm
Rainfall in the driest quarter	27 mm	43 mm	64 mm

It is barely found anywhere that freezes. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 108 research-grade observations of Argemone grandiflora 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 3 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.

Argemone grandiflora subsp. grandiflora
Argemone grandiflora var. armata (G.B.Ownbey) Shinners
Argemone mexicana var. grandiflora (Sweet) Reiche

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.