CPC Plant Profile: San Joaquin Adobe Sunburst
Search / Plant Profile / Pseudobahia peirsonii
Plant Profile

San Joaquin Adobe Sunburst (Pseudobahia peirsonii)

Photo of Pseudobahia peirsonii by Howard Orman Clark, Jr. Photo Credit: © 2008 Howard Orman Clark, Jr.
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Threatened
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 144905
  • Date Inducted in National Collection: 09/18/2021

San Joaquin adobe sunburst (sunflower family) is a hairy annual plant that grows to 18 inches tall. It has single orange flower heads at the tips of stems. It was apparently extirpated from the type locality by levee construction and residential and industrial development in Yuba County in the lower Sacramento Valley, California. (5-Year Review).

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

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 5 accessions of Pseudobahia peirsonii in orthodox seed collection. There are as many as 37119 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, California Botanic Garden has collected 2 seed accessions of Pseudobahia peirsonii from 2 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 53 maternal plants

Nature Serve Biotics
  • 05/02/2017

Endemic to California's Central Valley. There are currently 36 occurrences but most are very small (less than 250 individuals) and most of the plants are concentrated in 3 general areas. Residential development is the primary threat to the species. Other threats include road maintenance projects, and recreational activities, and competition from non-native plants.

Holly Forbes
  • 01/01/2010

Habitat destruction from residential or agricultural development Competition with non-native species Limited number of populations Flooding

Holly Forbes
  • 01/01/2010

The plant is found at 32 extant occurrences. Number of individuals varies widely depending on rainfall patterns.

Holly Forbes
  • 01/01/2010

Periodic surveys of few occurrences.

Holly Forbes
  • 01/01/2010

Draft Recovery Plan for Fifteen Plants from the Southern Sierra Foothills, California (in development).

Holly Forbes
  • 01/01/2010

Surveys of each population are needed. Population sizes for most occurrences are based on single visits from over 15 years ago.

Holly Forbes
  • 01/01/2010

Long term seed bank development.


Be the first to post an update!

Taxon Pseudobahia peirsonii
Authority Munz
Family Asteraceae
CPC Number 3651
ITIS 38302
Common Names Tulare Pseudobahia | San Joaquin adobe sunburst
Associated Scientific Names Pseudobahia peirsonii
Distribution Eastern San Joaquin Valley, including Stanislaus, Madera, Merced, and Fresno Counties.Three major population concentrations of P. peirsonii now include: east of Fresno in Fresno County, west of La
State Rank
State State Rank
California S1

Grasslands and in the transition zone between grasslands and blue oak woodland at elevations between 390 and 2,600 feet on level or gently sloping areas between low hills. (5-Year Review).

Ecological Relationships

Grows on north and northeast side of mima mounds where grass density is least. Primarily grows among non-native grasses. In habitat it occurs only on neutral to slightly alkaline heavy clays which may retain enough moisture for seed germination.

Common Name Name in Text Association Type Source InteractionID

Donate to CPC to Save this Species

Fall fundraising drive has begun! We're looking for 2,500 people to protect our planet. With you by our side, we will build a future where people live in harmony with nature. Come help and become a CPC donor today.

Donate Today