Taxon Details

Pentachaeta exilis ssp. aeolica

San Benito pentachaeta

View Report Copy Link Calflora eFlora CCH CalPhotos iNaturalist

Taxon Summary:

Pentachaeta exilis ssp. aeolica, commonly known as San Benito pentachaeta, is a annual herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, and Valley and foothill grassland, growing at elevations from 480 to 855 meters. Pentachaeta exilis ssp. aeolica is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Pentachaeta exilis (Gray) Gray ssp. aeolica Van Horn & Ornduff
Common Name: San Benito pentachaeta
Family:	Asteraceae
Element Code:	PDAST6X041
USDA Plants Symbol:	PEEXA
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G5T2
State Rank:	S2
Other Status:	BLM_S; SB_SBBG; USFS_S
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb

Blooming Period: Mar-May

Elevation:
480 - 855 meters
1575 - 2805 feet

General Habitats:

Cismontane woodland
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by vehicles and grazing. Potentially threatened by foot traffic. Possibly threatened by non-native plants. See University of California Publications in Botany 65:1-41 (1973) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	9
	Total EOs	% of EOs
EOs with Threat Listed:	5	31 %
Non-native plant impacts	4	25%
ORV activity	3	18%
Foot traffic/trampling	2	12%
Grazing	2	12%
Improper burning regime	1	6%
Feral pigs	1	6%
Other	1	6%
Recreational use (non-ORV)	1	6%
Road/trail construction/maint.	1	6%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					16
A	B	C	D	X	U
2	4	0	0	0	10

Occurrence Status:
Historical >20 Years	5
Recent <=20 Years	11

Presence:
Presumed Extant	16
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Monterey (MNT), San Benito (SBT), Santa Clara (SCL)

Quads: Name (Quad Code)
Alder Peak (3512183), Bear Canyon (3612113), Cone Peak (3612114), Eylar Mtn. (3712145), Hepsedam Peak (3612037), Isabel Valley (3712135), Jolon (3512182), Mt. Boardman (3712144), Mt. Stakes (3712134), San Benito Mtn. (3612036)

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

CNPS Rare Plant Inventory