Taxon Report
Acmispon haydonii (Orcutt) Brouilletpygmy lotus |
 © 1995 Saint Mary's College of California |
Taxon Summary
Acmispon haydonii, commonly known as pygmy lotus, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Pinyon and juniper woodland, and Sonoran desert scrub, growing at elevations from 520 to 1200 meters. Acmispon haydonii is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.Classification
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Scientific Name: |
Acmispon haydonii (Orcutt) Brouillet |
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Common Name: |
pygmy lotus |
| Family: | Fabaceae |
| Element Code: | PDFAB2A0H0 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Jan-Jun | Jan-Jun |
| Elevation: | 520-1200 (1705-3935) |
| General Habitats: | Pinyon and juniper woodland, Sonoran desert scrub |
| Microhabitat: | Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.3 |
| Global Rank: | G3 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CRES; SB_USDA |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 32 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 5 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 25 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Imperial (IMP), Riverside (RIV), San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Agua Caliente Springs (3211683), Borrego Palm Canyon (3311634), Coyote Wells (3211568), Earthquake Valley (3311614), In-ko-pah Gorge (3211661), Jacumba (3211662), Monument Peak (3211684), Palm Springs (3311675), Sombrero Peak (3211673), Sweeney Pass (3211672), Toro Peak (3311654), Tubb Canyon (3311624), Whale Peak (3311613) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 11 | 34 % | |
| ORV activity | 7 | 21% |
| Foot traffic/trampling | 6 | 18% |
| Vandalism/dumping/litter | 3 | 9% |
| Development | 2 | 6% |
| Other | 2 | 6% |
| Recreational use (non-ORV) | 1 | 3% |
| Road/trail construction/maint. | 1 | 3% |
| Mining | 1 | 3% |
| Non-native plant impacts | 1 | 3% |
Selected References
| West American Scientist 6:63 (1889) |
| Pittonia 2:149 (1890) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 November 2025].