Taxon Report
Phlox muscoides Nutt.squarestem phlox |
 © 2018 John Doyen |
Taxon Summary
Phlox muscoides, commonly known as squarestem phlox, is a perennial herb in the Polemoniaceae that is found in California and elsewhere. It occurs within Alpine boulder and rock field, Great Basin scrub, and Subalpine coniferous forest, growing at elevations from 1280 to 2700 meters. Phlox muscoides 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: |
Phlox muscoides Nutt. |
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Common Name: |
squarestem phlox |
| Family: | Polemoniaceae |
| Element Code: | PDPLM0D115 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: (May)Jun-Aug | (May)Jun-Aug |
| Elevation: | 1280-2700 (4200-8860) |
| General Habitats: | Alpine boulder and rock field, Great Basin scrub, Subalpine coniferous forest |
| Microhabitat: | Gravelly (sometimes), Rocky (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 2B.3 |
| Global Rank: | G4G5 |
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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: | 45 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 11 |
| Fair (C) | 6 |
| Poor (D) | 3 |
| None (X) | 0 |
| Unknown (U) | 21 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Lassen (LAS), Modoc (MOD), Shasta (SHA), Siskiyou (SIS) | |
| Quads: Name (Quad Code) | |
| Buckhorn Lake (4012081), Caldwell Butte (4112164), Captain Jacks Stronghold (4112175), Cedarville (4112052), Diamond Mtn. (4012036), Double Head Mtn. (4112172), Eagle Peak (4112032), Fort Bidwell (4112072), Fredonyer Pass (4012037), Lassen Peak (4012145), Mount Dome (4112176), Payne Peak (4112053), Perez (4112163), Pinnacle Lake (4112171), Red Rock Lakes (4112177), Sheep Mountain (4112178), Sheepy Lake (4112187), South Mtn. (4112076), Warren Peak (4112042), West of Snowstorm Mtn. (4012064), Whittemore Ridge (4112066) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 22 | 49 % | |
| Grazing | 12 | 26% |
| Road/trail construction/maint. | 9 | 20% |
| Foot traffic/trampling | 8 | 17% |
| Development | 2 | 4% |
| Logging | 1 | 2% |
| Non-native plant impacts | 1 | 2% |
| ORV activity | 1 | 2% |
| Other | 1 | 2% |
Selected References
| Phlox muscoides 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].