CPC Plant Profile: Calistoga Popcorn-flower
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Plant Profile

Calistoga Popcorn-flower (Plagiobothrys strictus)

  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Boraginaceae
  • State: CA
  • Nature Serve ID: 144163
  • Date Inducted in National Collection: 03/06/1993

annual herb

Participating Institutions
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  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, University of California Botanical Garden holds 1 accessions of Plagiobothrys strictus in orthodox seed collection. There are as many as 1463 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, University of California Botanical Garden has collected 1 seed accessions of Plagiobothrys strictus from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 10 maternal plants

Nature Serve Biotics
  • 05/02/2017

Narrowly endemic to hot spring-influenced habitats in Napa County, California. 2 of the 3 known occurrences are extant; 1 is scattered over about 4 ha near a small, undeveloped hot spring; the other is located at an airport. The latter population is threatend by further development, airport maintenance, vehicle parking, and grass mowing. A convalescent community has been proposed for the undeveloped site, but zoning restrictions have so far prevented this. Most (about 70%) of the species' original habitat in the county has been destroyed by development and conversion to viticulture.

  • 01/01/2010

construction of the airport and further development could threaten the population at Calistoga Airport the population near Myrtledale Hot Springs has been bisected by an asphalt road, and the landowner has proposed to build a convalescent community

  • 01/01/2010

two populations; one site occurs at the Calistoga Airport and another population is scattered over an area of private land near Myrtledale Hot Springs


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Taxon Plagiobothrys strictus
Authority (Greene) I.M. Johnston
Family Boraginaceae
CPC Number 3506
ITIS 32020
Common Names Calistoga Allocarya | Calistoga popcornflower
Associated Scientific Names Plagiobothrys strictus | Allocarya stricta | Krynitzkia stricta | Allocarya californica var. stricta
Distribution NA
State Rank
State State Rank
California S1

pools and swales adjacent to and fed by hot springs and small geysers in grasslands

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Lead Institution State Reintroduction Type Year of First Outplanting

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