CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record helianthella_castanea - Sun, Dec. 5, 2021, 12:32 ET b
Helianthella castanea
common nameDiablo helianthella
CalPhotos image
more photos
Charles Webber © 1998 California Academy of Sciences  Follow image link for photo data.
life formperennial herb
CA Rare Plant Rank
List 1B.2
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.2: Fairly endangered in California
state rank
S2      ranking system key
global rank
G2     G2: 6-20 occurrences OR 1,000-3,000 individuals OR 2,000-10,000 acres
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (19):
Cedar Mountain (445D) 3712155, Dublin (446B) 3712168, La Costa Valley (446D) 3712157, Hayward (447A) 3712261, San Francisco South (448B) 3712264, Byron Hot Springs (463C) 3712176, Antioch South (464A) 3712187, Clayton (464B) 3712188, Diablo (464C) 3712178, Tassajara (464D) 3712177, Walnut Creek (465A) 3712281, Briones Valley (465B) 3712282, Oakland East (465C)* 3712272, Las Trampas Ridge (465D) 3712271, Richmond (466A) 3712283, San Rafael (467A)* 3712285, Cordelia (482B) 3812222, Benicia (482C) 3812212, Mare Island (483D) 3812213
quad data info

Counties, states, regions:
Alameda (ALA), Contra Costa (CCA), Marin (MRN)*, San Francisco (SFO)*, San Mateo (SMT)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Broadleafed upland forest (BUFrs)
•Chaparral (Chprl)
•Cismontane woodland (CmWld)
•Coastal scrub (CoScr)
•Riparian woodland (RpWld)
•Valley and foothill grassland (VFGrs)/Usually rocky, axonal soils. Often in partial shade
blooming period Mar-Jun  
elevation range60 - 1300 meters
Threatened by urbanization, grazing, and fire suppression. Possibly threatened by road maintenance, recreational activities, and non-native plants.
full nameHelianthella castanea Greene
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HECA2 Element Code  PDAST4M020
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
search Google CNPS website    search Google entire web

Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Sun, Dec. 5, 2021 from

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