Jamesia americana (fivepetal cliffbush)

Plate 1 figs. a–h · 8 separate observations

Jamesia americana, photographed by Zac Peterson — fig. a Zac Peterson, CC BY 4.0 / 2021-10-28 / obs. 166436841

Jamesia americana, photographed by Northcut — fig. b Northcut, CC BY 4.0 / obs. 146268943

Jamesia americana, photographed by Reid Hardin — fig. c Reid Hardin, CC BY 4.0 / obs. 145054378

Jamesia americana, photographed by Jesse Rorabaugh — fig. d Jesse Rorabaugh, CC0 1.0 / obs. 155063604

Jamesia americana, photographed by Mike Ostrowski — fig. e Mike Ostrowski, CC BY-SA 4.0 / obs. 138481948

Jamesia americana, photographed by Parker Hopkins — fig. f Parker Hopkins, CC0 1.0 / obs. 79400296

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 8 botanical countries

Native distribution of Jamesia americana, 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
Arizona	ARI	NORTHERN AMERICA
California	CAL
Colorado	COL
Mexico Northeast	MXE
Nevada	NEV
New Mexico	NWM
Utah	UTA
Wyoming	WYO

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.

Flowering 92 in flower of 111 examined

67%

96%

87%

38%

Proportion of examined Jamesia americana in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	0	0	too few examined
May	4	6	67%	30% to 90%
Jun	44	46	96%	85% to 99%
Jul	39	45	87%	74% to 94%
Aug	3	8	38%	14% to 69%
Sep	2	3	too few examined
Oct	0	3	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jun. Each bar is the share of Jamesia americana observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 92 of 111 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 8 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Where it actually grows measured, from 1,447 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-15.9 °C	-11.4 °C	-6.7 °C
Warmest month, mean daily high	19.4 °C	23.6 °C	27.4 °C
Annual rainfall	414 mm	525 mm	841 mm
Rainfall in the driest quarter	41 mm	63 mm	120 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,447 research-grade observations of Jamesia americana 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. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

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.

Edwinia americana (Torr. & A.Gray) A.Heller
Edwinia californica Small
Edwinia macrocalyx Small
Jamesia americana f. rosea (Purpus ex C.K.Schneid.) Rehder
Jamesia americana f. tristyla Kuntze
Jamesia americana subsp. californica (Small) A.E.Murray
Jamesia americana var. californica (Small) Jeps.
Jamesia californica Fedde
Jamesia macrocalyx Fedde

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.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
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.