Taxon Details

Leptosyne hamiltonii

Mt. Hamilton coreopsis

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Taxon Summary:

Leptosyne hamiltonii, commonly known as Mt. Hamilton coreopsis, is a annual herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, growing at elevations from 550 to 1300 meters. Leptosyne hamiltonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Leptosyne hamiltonii Elmer
Common Name: Mt. Hamilton coreopsis
Family:	Asteraceae
Element Code:	PDAST2L0C0
USDA Plants Symbol:
Synonyms/Other Names: Coreopsis hamiltonii
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2
State Rank:	S2
Other Status:	BLM_S; SB_UCBG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb

Blooming Period: Mar-May

Elevation:
550 - 1300 meters
1805 - 4265 feet

General Habitats:

Cismontane woodland (rocky)

Microhabitat Details:

Microhabitat:

Notes

Notes: Known only from the Mt. Hamilton Range. See Botanical Gazette 41:323-324 (1906) for original description, and Madroño 4(7):214-215 (1938) for revised nomenclature.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	5	24 %
Grazing	3	14%
Non-native plant impacts	1	4%
Vandalism/dumping/litter	1	4%
Erosion/runoff	1	4%
Feral pigs	1	4%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					21
A	B	C	D	X	U
12	6	0	0	0	3

Occurrence Status:
Historical >20 Years	19
Recent <=20 Years	2

Presence:
Presumed Extant	21
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Alameda (ALA), Santa Clara (SCL), Stanislaus (STA)

Quads: Name (Quad Code)
Cedar Mtn. (3712155), Isabel Valley (3712135), Lick Observatory (3712136), Lone Tree Creek (3712154), Mississippi Creek (3712124), Mt. Stakes (3712134), Solyo (3712153)

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

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CNPS Rare Plant Inventory