Taxon Report
Plagiobothrys strictus (Greene) Jtn.Calistoga popcornflower |
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Taxon Summary
Plagiobothrys strictus, commonly known as Calistoga popcornflower, is a annual herb in the Boraginaceae that is found only in California. It occurs within Meadows and seeps, Valley and foothill grassland, and Vernal pools, growing at elevations from 90 to 160 meters. Plagiobothrys strictus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Plagiobothrys strictus (Greene) Jtn. |
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Common Name: |
Calistoga popcornflower |
| Family: | Boraginaceae |
| Element Code: | PDBOR0V120 |
| USDA Plants Symbol: | PLST2 |
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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: | 90-160 (295-525) |
| General Habitats: | Meadows and seeps, Valley and foothill grassland, Vernal pools |
| Microhabitat: | Alkaline |
| Microhabitat Details: | alkaline areas near thermal springs |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CT |
| Fed List: | FE |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 3 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 2 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 1 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Napa (NAP) | |
| Quads: Name (Quad Code) | |
| Calistoga (3812255) | |
Threat List Data from the CNDDB
| Threat List Total: | 3 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 67 % | |
| Development | 2 | 66% |
| Other | 2 | 66% |
| Road/trail construction/maint. | 1 | 33% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 31 October 2025].