Taxon Report
Poa atropurpurea Scribn.San Bernardino blue grass |
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Species Description:
Poa atropurpurea, commonly known as San Bernardino blue grass, is a perennial rhizomatous herb in the Poaceae that is found only in California. It occurs within Meadows and seeps, growing at elevations from 1360 to 2455 meters. Poa atropurpurea is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.
Classification
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Scientific Name: |
Poa atropurpurea Scribn. |
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Common Name: |
San Bernardino blue grass |
| Family: | Poaceae |
| Element Code: | PMPOA4Z0A0 |
| USDA Plants Symbol: | POAT |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial rhizomatous herb |
| Blooming Period: (Apr)May-Jul(Aug) | (Apr)May-Jul(Aug) |
| Elevation: | 1360-2455 (4460-8055) |
| General Habitats: | Meadows and seeps |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 27 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 7 |
| Fair (C) | 2 |
| Poor (D) | 2 |
| None (X) | 0 |
| Unknown (U) | 16 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Bernardino (SBD), San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Big Bear City (3411637), Big Bear Lake (3411628), Cuyamaca Peak (3211685), Descanso (3211675), Fawnskin (3411638), Julian (3311615), Monument Peak (3211684), Moonridge (3411627), Mount Laguna (3211674), Onyx Peak (3411626), Palomar Observatory (3311637) | |
Threat List Data from the CNDDB
| Threat List Total: | 12 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 19 | 70 % | |
| Grazing | 16 | 59% |
| Development | 10 | 37% |
| Recreational use (non-ORV) | 6 | 22% |
| Non-native plant impacts | 5 | 18% |
| ORV activity | 4 | 14% |
| Other | 2 | 7% |
| Vandalism/dumping/litter | 2 | 7% |
| Foot traffic/trampling | 2 | 7% |
| Mining | 1 | 3% |
| Non-native animal impacts | 1 | 3% |
| Wood cutting or brush clearing | 1 | 3% |
| Altered flood/tidal/hydrologic regime | 1 | 3% |
Notes
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Known from approximately twenty occurrences in the San Bernardino Mtns. (SBD Co.) and Laguna Mtns. (SDG Co.). Threatened by development, grazing, hydrological alterations, mining, recreational activities, and vehicles, and potentially by hybridization with non-native P. pratensis |
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Threats: |
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Taxonomy: |
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 January 2025].