Taxon Report
Juncus leiospermus F.J. Herm. var. leiospermusRed Bluff dwarf rush |
 ©2016 Dylan Neubauer |
Taxon Summary
Juncus leiospermus var. leiospermus, commonly known as Red Bluff dwarf rush, is a annual herb in the Juncaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Meadows and seeps, Valley and foothill grassland, and Vernal pools, growing at elevations from 35 to 1250 meters. Juncus leiospermus var. leiospermus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Juncus leiospermus F.J. Herm. var. leiospermus |
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Common Name: |
Red Bluff dwarf rush |
| Family: | Juncaceae |
| Element Code: | PMJUN011L2 |
| USDA Plants Symbol: | JULEL |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-Jun | Mar-Jun |
| Elevation: | 35-1250 (115-4100) |
| General Habitats: | Chaparral, Cismontane woodland, Meadows and seeps, Valley and foothill grassland, Vernal pools |
| Microhabitat: | Vernally Mesic |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G2T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 62 |
| Element Occurrence Ranks: | |
| Excellent (A) | 7 |
| Good (B) | 18 |
| Fair (C) | 8 |
| Poor (D) | 3 |
| None (X) | 4 |
| Unknown (U) | 22 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT), Placer (PLA), Shasta (SHA), Tehama (TEH) | |
| Quads: Name (Quad Code) | |
| Balls Ferry (4012242), Bend (4012232), Black Butte Dam (3912273), Blossom (4012224), Burney (4012186), Burney Falls (4112116), Burney Mtn. West (4012176), Campbell Mound (3912187), Cherokee (3912165), Cottonwood (4012243), Enterprise (4012253), Henleyville (3912283), Olinda (4012244), Oroville (3912155), Palo Cedro (4012252), Project City (4012263), Red Bluff East (4012222), Red Bluff West (4012223), Richardson Springs (3912177), Roseville (3812173), Shippee (3912156), Tuscan Buttes Ne (4012241), West of Gerber (4012213) | |
Threat List Data from the CNDDB
| Threat List Total: | 12 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 38 | 61 % | |
| Development | 22 | 35% |
| ORV activity | 10 | 16% |
| Grazing | 10 | 16% |
| Agriculture | 5 | 8% |
| Logging | 3 | 4% |
| Dam/Inundation | 2 | 3% |
| Other | 2 | 3% |
| Road/trail construction/maint. | 2 | 3% |
| Vandalism/dumping/litter | 1 | 1% |
| Altered flood/tidal/hydrologic regime | 1 | 1% |
| Foot traffic/trampling | 1 | 1% |
| Mining | 1 | 1% |
Selected References
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Leaflets of Western Botany 5:113 (1948) |
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Memoirs of the New York Botanical Garden 39:46-51 (1986) |
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Juncus leiospermus var. leiospermus profile for potential Species of Conservation Concern evaluation (2018) |
| USFS Potential Species of Conservation Concern Profile |
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 January 2025].