Taxon Report

Perideridia gairdneri (H. & A.) Math. ssp. gairdneri

Gairdner's yampah

Print Report


©2007 Neal Kramer

Taxon Summary

Perideridia gairdneri ssp. gairdneri, commonly known as Gairdner's yampah, is a perennial herb in the Apiaceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, Coastal prairie, Valley and foothill grassland, and Vernal pools, growing at elevations from 0 to 610 meters. Perideridia gairdneri ssp. gairdneri is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

  Classification
Scientific Name:
 Perideridia gairdneri (H. & A.) Math. ssp. gairdneri
Common Name:
 Gairdner's yampah
Family: Apiaceae
Element Code: PDAPI1N062
USDA Plants Symbol: PEGAG
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: Jun-Oct Jun-Oct
Elevation: 0-610 (0-2000)
General Habitats: Broadleafed upland forest, Chaparral, Coastal prairie, Valley and foothill grassland, Vernal pools
Microhabitat: Vernally Mesic
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 4.2
Global Rank: G5T3T4
State Rank:
 S3S4
State List: None
Fed List: None
Other Status: SB_SBBG; SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 0
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 0

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Del Norte (DNT), Kern (KRN), Marin (MRN), Mendocino (MEN), Monterey (MNT), San Luis Obispo (SLO), San Mateo (SMT)(?), Santa Clara (SCL), Santa Cruz (SCR), Solano (SOL), Sonoma (SON)
Quads: Name (Quad Code)
Ano Nuevo (3712213), Bear Mountain (3511826), Burro Mountain (3512173), Cambria (3512151), Cape San Martin (3512184), Drakes Bay (3812218), Elmira (3812138), Franklin Point (3712223), Healdsburg (3812257), Hiouchi (4112471), La Honda (3712233), Mt. Carmel (3612147), Pigeon Point (3712224), Plantation (3812353), Point Arena (3812386), Purdys Gardens (3912311), San Rafael (3712285), Santa Cruz (3612281), Spreckels (3612156), Tomales (3812228), Two Rock (3812237), Watsonville East (3612186), Willits (3912343)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 0 %

Notes
Endangered in the southern portion of its range; status of occurrences uncertain. Can be relatively common locally, especially in northern counties. Is plant extant in SMT Co.? Threatened by agriculture, grazing, non-native plants, habitat alteration, and urbanization. See University of California Publications in Botany 55:1-74 (1969) for taxonomic treatment.
Threats:
Taxonomy:

Selected References

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].