Taxon Report

Helianthus inexpectatus D.J. Keil & Elvin

Newhall sunflower

Print Report


© 2012 Anuja Parikh and Nathan Gale

  Classification
Scientific Name:
 Helianthus inexpectatus D.J. Keil & Elvin
Common Name:
 Newhall sunflower
Family: Asteraceae
Element Code: PDAST4N250
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial rhizomatous herb
Blooming Period: Aug-Oct Aug-Oct
Elevation: 305-305 (1000-1000)
General Habitats: Marshes and swamps, Riparian woodland
Microhabitat: Seeps
Microhabitat Details: freshwater

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G1
State Rank:
 S1
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG
CRPR Changes:
  • added to 1B.1 on 2010-08-16

Occurrence Data from the CNDDB
Total Occurrences: 1
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 1
   Poor (D) 0
   None (X) 0
   Unknown (U) 0

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Los Angeles (LAX)
Quads: Name (Quad Code)
Newhall (3411845)

Threat List Data from the CNDDB

Threat List Total: 4
EOs with Threat Listed: Total EOs % of EOs
1 100 %
Altered flood/tidal/hydrologic regime 1 100%
Development 1 100%
Non-native plant impacts 1 100%
Over-collecting/poaching 1 100%

Notes
Known from a single occurrence of fewer than 10 individuals. See Aliso 28:59-62 (2010) for original description.
Threats:
Potentially threatened by development, hydrological alterations, habitat alteration and loss, urban runoff, non-native plants, recreational activities, and foot traffic. Possibly threatened by air pollution and pollination reduction.
Taxonomy:

Selected References

CRPR List Addition on 2010-08-16
Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].