Taxon Report
Pentachaeta bellidiflora Greenewhite-rayed pentachaeta |
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Taxon Summary
Pentachaeta bellidiflora, commonly known as white-rayed pentachaeta, is a annual herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, and Valley and foothill grassland (often serpentine), growing at elevations from 35 to 620 meters. Pentachaeta bellidiflora is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Pentachaeta bellidiflora Greene |
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Common Name: |
white-rayed pentachaeta |
| Family: | Asteraceae |
| Element Code: | PDAST6X030 |
| USDA Plants Symbol: | PEBE |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-May | Mar-May |
| Elevation: | 35-620 (115-2035) |
| General Habitats: | Cismontane woodland, Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 14 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 10 |
| Unknown (U) | 3 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Marin (MRN)*, San Mateo (SMT), Santa Cruz (SCR)* | |
| Quads: Name (Quad Code) | |
| Big Basin (3712222)*, Castle Rock Ridge (3712221), Davenport (3712212)*, Felton (3712211)*, Laurel (3712118), Montara Mountain (3712254)*, Point Bonita (3712275)*, San Francisco North (3712274), San Francisco South (3712264)*, San Mateo (3712253)*, San Quentin (3712284)*, San Rafael (3712285)*, Santa Cruz (3612281), Soquel (3612188), Woodside (3712243) | |
Threat List Data from the CNDDB
| Threat List Total: | 5 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 3 | 21 % | |
| Non-native plant impacts | 1 | 7% |
| ORV activity | 1 | 7% |
| Other | 1 | 7% |
| Recreational use (non-ORV) | 1 | 7% |
| Vandalism/dumping/litter | 1 | 7% |
Notes
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Historical occurrences lost to development. MNT Co. occurrence once attributed to this species is actually P. exilis |
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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 15 November 2025].