Taxon Report
Carex halliana BaileyOregon sedge |
 ©2010 Keir Morse |
Taxon Summary
Carex halliana, commonly known as Oregon sedge, is a perennial rhizomatous herb in the Cyperaceae that is found in California and elsewhere. It occurs within Meadows and seeps, Subalpine coniferous forest, and Upper montane coniferous forest, growing at elevations from 1370 to 2105 meters. Carex halliana is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.Classification
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Scientific Name: |
Carex halliana Bailey |
|
Common Name: |
Oregon sedge |
| Family: | Cyperaceae |
| Element Code: | PMCYP035M0 |
| USDA Plants Symbol: | CAHA2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial rhizomatous herb |
| Blooming Period: (May)Jul-Sep | (May)Jul-Sep |
| Elevation: | 1370-2105 (4495-6905) |
| General Habitats: | Meadows and seeps, Subalpine coniferous forest, Upper montane coniferous forest |
| Microhabitat: | |
| Microhabitat Details: | Often pumice |
Conservation Status
| CA Rare Plant Rank: | 2B.3 |
| Global Rank: | G4G5 |
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State Rank: |
S2 |
| 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: | 17 |
| Element Occurrence Ranks: | |
| Excellent (A) | 5 |
| Good (B) | 7 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 4 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Modoc (MOD), Siskiyou (SIS), Trinity (TRI) | |
| Quads: Name (Quad Code) | |
| Ash Creek Butte (4112241), Bonita Butte (4112166), Border Mtn. (4112144), Medicine Lake (4112155), Scott Mountain (4112236), Somes Bar (4112344), Ukonom Mtn. (4112354), West of Kephart (4112154) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 12 | 71 % | |
| Other | 5 | 29% |
| Road/trail construction/maint. | 4 | 23% |
| Logging | 3 | 17% |
| ORV activity | 2 | 11% |
| Foot traffic/trampling | 1 | 5% |
| Improper burning regime | 1 | 5% |
| Wood cutting or brush clearing | 1 | 5% |
| Recreational use (non-ORV) | 1 | 5% |
Selected References
| Carex halliana profile for potential Species of Conservation Concern evaluation (2017) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 October 2025].