CNPS

CNPS Rare Plant Inventory



Species Details

Pentagramma rebmanii

Rebman's silverback fern

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Species Description:

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

Scientific Name:
Pentagramma rebmanii (Winner & M.G. Simpson) Schuettp. & Windham
Common Name:
Rebman's silverback fern
Family: Pteridaceae
Element Code: PPADI0Q030
USDA Plants Symbol:
Synonyms/Other Names:
Name Status: JEP, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.3
Fed List: None
State List: None
Global Rank: G3
State Rank:
 S3
Other Status:
CRPR Changes:
added to 1B.3 on 2024-05-21
Add Date: 2024-05-21
Date Edited: 2024-10-02

  Ecology and Life History

Lifeform: perennial rhizomatous herb
Blooming Period:
JFMAMJJASOND
Elevation:
175 - 1760 meters
575 - 5775 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Riparian woodland
Microhabitat Details: Seeps and other seasonally moist sites on ± shaded, generally north-facing, rocky slopes or canyon bottoms.
Microhabitat:
  • Clay (sometimes)
  • Decomposed granitic (sometimes)
  • Gabbroic (sometimes)
  • Granitic (often)
  • Mesic
  • Rock crevices (sometimes)
  • Rocky (often)
  • Seeps
  • Slopes
  • Streambanks

  Notes

Notes:
Threats:
Potentially threatened by development.
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.

  Threat List Data from the CNDDB

Threat List Total: 0
Total EOs % of EOs
EOs with Threat Listed: 0 0 %
THREAT LIST:

  Occurrence Data from the CNDDB

Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
Baja California (BA), California (CA)
California Counties and Islands: Name (Code)
Quads: Name (Quad Code)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Location Data is Forthcoming from the CNDDB
Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

CNPS Status Review: Pentagramma rebmanii: Proposed Addition to CRPR 1B.3 (2024)
Original Description: Madroño 54(4): 345 (2008)
Revised Nomenclature: Systematic Botany 40(3): 641 (2015)
Revised Nomenclature: Journal of the Botanical Research Institute of Texas 17(1): 28 (2023)

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 January 2025].
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