Taxon Report
Pentagramma rebmanii (Winner & M.G. Simpson) Schuettp. & WindhamRebman's silverback fern |
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Taxon Summary
Pentagramma rebmanii, commonly known as Rebman's silverback fern, is a perennial rhizomatous herb in the Pteridaceae that is found in California and elsewhere. It occurs within Chaparral, Cismontane woodland, and Riparian woodland, growing at elevations from 175 to 1760 meters. Pentagramma rebmanii 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: |
Pentagramma rebmanii (Winner & M.G. Simpson) Schuettp. & Windham |
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Common Name: |
Rebman's silverback fern |
| Family: | Pteridaceae |
| Element Code: | PPADI0Q030 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial rhizomatous herb |
| Blooming Period: | |
| Elevation: | 175-1760 (575-5775) |
| General Habitats: | Chaparral, Cismontane woodland, Riparian woodland |
| Microhabitat: | Clay (sometimes), Decomposed granitic (sometimes), Gabbroic (sometimes), Granitic (often), Mesic, Rock crevices (sometimes), Rocky (often), Seeps, Slopes, Streambanks |
| Microhabitat Details: | Seeps and other seasonally moist sites on ± shaded, generally north-facing, rocky slopes or canyon bottoms. |
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: | |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 0 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Quads: Name (Quad Code) | |
Threat List Data from the CNDDB
| Threat List Total: | 0 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 0 | 0 % | |
Notes
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Threats: |
| Potentially threatened by development. |
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Taxonomy: |
| Rare, unnamed polyploids resemble this diploid species. Pentagramma rebmanii has a dense, white farina (powdery-waxy secretion) on the lower leaf surface but differs from other Pentagramma taxa in having sparse, white farina on the upper leaf surface as well. |
Selected References
| Pentagramma rebmanii: Proposed Addition to CRPR 1B.3 (2024) |
| Madroño 54(4): 345 (2008) |
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Systematic Botany 40(3): 641 (2015) |
| Journal of the Botanical Research Institute of Texas 17(1): 28 (2023) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 22 February 2025].