Micranthes rhomboidea (diamondleaf saxifrage)

Plate 1 figs. a–h · 8 separate observations

Micranthes rhomboidea, photographed by Josiah Londerée — fig. a Josiah Londerée, CC BY 4.0 / 2022-05-31 / obs. 202342785

Micranthes rhomboidea, photographed by Alaina Krakowiak — fig. b Alaina Krakowiak, CC BY 4.0 / obs. 197702273

Micranthes rhomboidea, photographed by Reid Hardin — fig. c Reid Hardin, CC BY 4.0 / obs. 145050878

Micranthes rhomboidea, photographed by Cheryl McCleary-Catalano — fig. d Cheryl McCleary-Catalano, CC BY 4.0 / obs. 79051195

Micranthes rhomboidea, photographed by Craig Martin — fig. e Craig Martin, CC0 1.0 / obs. 78401883

Micranthes rhomboidea, photographed by Cecelia Alexander — fig. g Cecelia Alexander, CC0 1.0 / obs. 70565710

Micranthes rhomboidea, photographed by Robert Webster — fig. h Robert Webster, CC BY-SA 4.0 / obs. 62407522

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 7 botanical countries

Native distribution of Micranthes rhomboidea, 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
Colorado	COL
Idaho	IDA
Montana	MNT
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 109 in flower of 126 examined

82%

90%

94%

82%

Proportion of examined Micranthes rhomboidea 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	2	4	too few examined
May	31	38	82%	67% to 91%
Jun	38	42	90%	78% to 96%
Jul	29	31	94%	79% to 98%
Aug	9	11	82%	52% to 95%
Sep	0	0	too few examined
Oct	0	0	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jul. Each bar is the share of Micranthes rhomboidea 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. 109 of 126 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 1,071 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-21.2 °C	-15.5 °C	-8.3 °C
Warmest month, mean daily high	16.2 °C	20.7 °C	27.8 °C
Annual rainfall	444 mm	776 mm	1,267 mm
Rainfall in the driest quarter	48 mm	117 mm	257 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 1,071 research-grade observations of Micranthes rhomboidea 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 17 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.

Micranthes crenatifolia Small
Micranthes franciscana Small
Micranthes greenei Small
Micranthes interrupta Small
Saxifraga austrina A.Nelson
Saxifraga crenatifolia (Small) Fedde
Saxifraga franciscana (Small) Fedde
Saxifraga greenei Blank.
Saxifraga integrifolia var. rhomboidea M.E.Jones
Saxifraga interrupta Greene
Saxifraga rhomboidea Greene
Saxifraga rhomboidea f. franciscana (Small) Engl. & Irmsch.
Saxifraga rhomboidea var. austrina A.Nelson
Saxifraga rhomboidea var. crenatifolia Engl. & Irmsch.
Saxifraga rhomboidea var. franciscana (Small) Kearney & Peebles
Saxifraga rhomboidea var. interrupta Engl. & Irmsch.
Saxifraga rhomboidea var. typica Engl. & Irmsch.

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.
USDA PLANTS Database. common name, checklist symbol SARH2. public domain. 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.