Taxon Report

Helianthella castanea Greene

Diablo helianthella

Print Report


© 2013 Christopher Bronny

  Classification
Scientific Name:
 Helianthella castanea Greene
Common Name:
 Diablo helianthella
Family: Asteraceae
Element Code: PDAST4M020
USDA Plants Symbol: HECA2
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: Mar-Jun Mar-Jun
Elevation: 60-1300 (195-4265)
General Habitats: Broadleafed upland forest, Chaparral, Cismontane woodland, Coastal scrub, Riparian woodland, Valley and foothill grassland
Microhabitat: Rocky (usually)
Microhabitat Details: Azonal soil, often partial Shade

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: BLM_S; SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 107
Element Occurrence Ranks:
   Excellent (A) 11
   Good (B) 35
   Fair (C) 22
   Poor (D) 2
   None (X) 1
   Unknown (U) 36

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Marin (MRN)*, San Francisco (SFO)*, San Mateo (SMT)
Quads: Name (Quad Code)
Antioch South (3712187), Benicia (3812212), Briones Valley (3712282), Cedar Mtn. (3712155), Clayton (3712188), Diablo (3712178), Dublin (3712168), Hayward (3712261), Hunters Point (3712263), Las Trampas Ridge (3712271), Oakland East (3712272)*, Richmond (3712283), San Francisco South (3712264), San Rafael (3712285)*, Tassajara (3712177), Walnut Creek (3712281)

Threat List Data from the CNDDB

Threat List Total: 12
EOs with Threat Listed: Total EOs % of EOs
55 51 %
Grazing 25 23%
Road/trail construction/maint. 18 16%
Foot traffic/trampling 17 15%
Development 12 11%
Recreational use (non-ORV) 10 9%
Other 8 7%
Improper burning regime 8 7%
Erosion/runoff 6 5%
Non-native plant impacts 6 5%
Insufficient population/stand size 1 0%
Vandalism/dumping/litter 1 0%
Wood cutting or brush clearing 1 0%

Notes
Threats:
Threatened by urbanization, grazing, and fire suppression. Possibly threatened by road maintenance, recreational activities, and non-native plants.
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].