Taxon Report
Chorizanthe cuspidata Wats. var. cuspidataSan Francisco Bay spineflower |
|
Taxon Summary
Chorizanthe cuspidata var. cuspidata, commonly known as San Francisco Bay spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Coastal bluff scrub, Coastal dunes, Coastal prairie, and Coastal scrub, growing at elevations from 3 to 215 meters. Chorizanthe cuspidata var. cuspidata is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
|
Scientific Name: |
Chorizanthe cuspidata Wats. var. cuspidata |
|
Common Name: |
San Francisco Bay spineflower |
| Family: | Polygonaceae |
| Element Code: | PDPGN04081 |
| USDA Plants Symbol: | CHCUC |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jul(Aug) | Apr-Jul(Aug) |
| Elevation: | 3-215 (10-705) |
| General Habitats: | Coastal bluff scrub, Coastal dunes, Coastal prairie, Coastal scrub |
| Microhabitat: | Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2T1 |
|
State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 17 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 0 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 2 |
| Unknown (U) | 12 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Alameda (ALA)*, Marin (MRN), San Francisco (SFO), San Mateo (SMT), Sonoma (SON)? | |
| Quads: Name (Quad Code) | |
| Bodega Head (3812331)?, Montara Mountain (3712254), Oakland West (3712273)*, San Francisco North (3712274), San Francisco South (3712264), San Rafael (3712285), Tomales (3812228)? | |
Threat List Data from the CNDDB
| Threat List Total: | 6 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 29 % | |
| Non-native plant impacts | 3 | 17% |
| Development | 2 | 11% |
| Foot traffic/trampling | 2 | 11% |
| Other | 2 | 11% |
| Road/trail construction/maint. | 1 | 5% |
| ORV activity | 1 | 5% |
Notes
| Plant may occur in SCL Co.; need more information. Threatened by non-native plants. Closely related to C. pungens. Some plants from Pt. Reyes, MRN Co. (485B, 485C) to Bodega Head, SON Co. (502C, 503D) probably intermediate to var. villosa. See C. cuspidata in The Jepson Manual. See Proceedings of the Davenport Academy of Natural Sciences 4:60 (1884) for original description, and Phytologia 66(2):127-129 (1989) for taxonomic treatment. |
|
Threats: |
|
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 30 January 2025].