Taxon Report

Erioneuron pilosum (Buckl.) Nash

hairy erioneuron

Print Report


Taxon Summary

Erioneuron pilosum, commonly known as hairy erioneuron, is a perennial herb in the Poaceae that is found in California and elsewhere. It occurs within Pinyon and juniper woodland (sometimes carbonate, and rocky), growing at elevations from 1420 to 2010 meters. Erioneuron pilosum is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

  Classification
Scientific Name:
 Erioneuron pilosum (Buckl.) Nash
Common Name:
 hairy erioneuron
Family: Poaceae
Element Code: PMPOA2S020
USDA Plants Symbol: ERPI5
Synonyms/Other Names:
  • Tridens pilosus

Ecology and Life History
Lifeform: perennial herb
Blooming Period: (Apr)May-Jun (Apr)May-Jun
Elevation: 1420-2010 (4660-6595)
General Habitats: Pinyon and juniper woodland
Microhabitat:
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 2B.3
Global Rank: G5
State Rank:
 S2
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG
CRPR Changes:
  • changed from 2.3 to 2B.3 on 2013-06-12

Occurrence Data from the CNDDB
Total Occurrences: 22
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 3
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 19

Location
California Endemic:  False
California Counties and Islands: Name (Code)
Inyo (INY), San Bernardino (SBD)
Quads: Name (Quad Code)
Blackwater Mine (3511577), Cima Dome (3511535), Clark Mtn. (3511555), Fountain Peak (3411585), Horse Thief Springs (3511578), Ivanpah (3511533), Marl Mountains (3511526), Mescal Range (3511545), White Top Mtn. (3611774)

Threat List Data from the CNDDB

Threat List Total: 6
EOs with Threat Listed: Total EOs % of EOs
4 18 %
Non-native plant impacts 3 13%
ORV activity 1 4%
Development 1 4%
Grazing 1 4%
Mining 1 4%
Non-native animal impacts 1 4%

Notes
Possibly threatened by non-native plants. See American Journal of Botany 48:565-573 (1961) for taxonomic treatment.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 19 November 2025].