Taxon Report
Chorizanthe breweri Wats.Brewer's spineflower |
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Taxon Summary
Chorizanthe breweri, commonly known as Brewer's spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 45 to 800 meters. Chorizanthe breweri is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.Classification
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Scientific Name: |
Chorizanthe breweri Wats. |
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Common Name: |
Brewer's spineflower |
| Family: | Polygonaceae |
| Element Code: | PDPGN04050 |
| USDA Plants Symbol: | CHBR2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Aug | Apr-Aug |
| Elevation: | 45-800 (150-2625) |
| General Habitats: | Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal scrub |
| Microhabitat: | Gravelly (sometimes), Rocky (sometimes), Serpentine |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.3 |
| Global Rank: | G3 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_SBBG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 45 |
| Element Occurrence Ranks: | |
| Excellent (A) | 9 |
| Good (B) | 8 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 25 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Monterey (MNT), San Luis Obispo (SLO) | |
| Quads: Name (Quad Code) | |
| Arroyo Grande NE (3512025), Atascadero (3512046), Burro Mountain (3512173), Lopez Mtn. (3512035), Morro Bay South (3512037), Pismo Beach (3512026), Port San Luis (3512027), San Luis Obispo (3512036), Santa Margarita (3512045), Santa Margarita Lake (3512034) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 22 | 49 % | |
| Grazing | 7 | 15% |
| Improper burning regime | 6 | 13% |
| Military operations | 6 | 13% |
| Feral pigs | 6 | 13% |
| Foot traffic/trampling | 6 | 13% |
| Non-native plant impacts | 6 | 13% |
| Other | 4 | 8% |
| Road/trail construction/maint. | 4 | 8% |
| Development | 3 | 6% |
| Erosion/runoff | 3 | 6% |
| Mining | 1 | 2% |
| Vandalism/dumping/litter | 1 | 2% |
| Recreational use (non-ORV) | 1 | 2% |
| ORV activity | 1 | 2% |
Notes
| Threatened by pipeline construction. Possibly threatened by road construction, road maintenance, and vehicles. Closely related to C. staticoides. See Proceedings of the American Academy of Arts and Sciences 12:270 (1877) for original description, and Phytologia 66(2):163-164 (1989) for taxonomic treatment. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 February 2025].