CNPS

CNPS Rare Plant Inventory



Taxon Details

Ancistrocarphus keilii

Santa Ynez groundstar

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Photo of Ancistrocarphus keilii
© 2023 Kristen M Nelson 		Photo of Ancistrocarphus keilii
© 2023 Kristen M Nelson 		Photo of Ancistrocarphus keilii
© 2023 Kristen M Nelson

Taxon Summary:

Ancistrocarphus keilii, commonly known as Santa Ynez groundstar, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 40 to 130 meters. Ancistrocarphus keilii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification

Scientific Name:
Ancistrocarphus keilii Morefield
Common Name:
Santa Ynez groundstar
Family: Asteraceae
Element Code: PDASTD5020
USDA Plants Symbol:
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.1
Fed List: None
State List: None
Global Rank: G1
State Rank:
 S1
Other Status: BLM_S
CRPR Changes:
added to 1B on 2005-07-27
Add Date: 2005-01-01
Date Edited: 2025-05-06

  Ecology and Life History

Lifeform: annual herb
Blooming Period: Mar-Apr
JFMAMJJASOND
Elevation:
40 - 130 meters
130 - 425 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
Microhabitat Details:
Microhabitat:
  • Sandy

  Notes

Notes:
Known only from the recent type locality and one ambiguous historical collection, all in the Santa Ynez River drainage.
Threats:
Taxonomy:
See Novon 14(4):464 (2004) for original description.

  Threat List Data from the CNDDB

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

 

  Occurrence Data from the CNDDB

Total Occurrences: 2
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 2
Occurrence Status:
Historical >20 Years 2
Recent <=20 Years 0
Presence:
Presumed Extant 2
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Santa Barbara (SBA)
Quads: Name (Quad Code)
Lompoc (3412064), Lompoc Hills (3412054), Los Alamos (3412063), Santa Rosa Hills (3412053), Surf (3412065)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

CNPS Status Review: Proposed Addition to CRPR 1B (2005)

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 July 2025].
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