Plate 1 figs. a–f · 3 observations
This species has been photographed under an open licence only 3 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.
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
| Region | TDWG code | Continent |
|---|---|---|
| Arizona | ARI | NORTHERN AMERICA |
| California | CAL | |
| Colorado | COL | |
| Idaho | IDA | |
| Montana | MNT | |
| Nevada | NEV | |
| 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.
Where it actually grows measured, from 57 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -16.0 °C | -11.3 °C | -1.7 °C |
| Warmest month, mean daily high | 21.7 °C | 25.8 °C | 31.9 °C |
| Annual rainfall | 228 mm | 455 mm | 909 mm |
| Rainfall in the driest quarter | 28 mm | 79 mm | 150 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 57 research-grade observations of Astragalus argophyllus 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 11 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.
- Astragalus argophyllus var. castaneiformis M.E.Jones
- Astragalus argophyllus var. cnicensis M.E.Jones
- Astragalus argophyllus var. pephragmenoides Barneby
- Astragalus argophyllus var. typicus Barneby
- Astragalus chamaeleuce var. panguicensis M.E.Jones
- Astragalus panguicensis (M.E.Jones) M.E.Jones
- Astragalus sabinarum (Rydb.) Barneby
- Astragalus uintensis M.E.Jones
- Batidophaca sabinarum Rydb.
- Xylophacos argophyllus (Nutt.) Rydb.
- Xylophacos uintensis (M.E.Jones) Rydb.
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 ASAR4. 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.