Taxon Details

Lomatium observatorium

Mt. Hamilton lomatium

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Taxon Summary:

Lomatium observatorium, commonly known as Mt. Hamilton lomatium, is a perennial herb in the Apiaceae that is found only in California. It occurs within Cismontane woodland, growing at elevations from 1219 to 1330 meters. Lomatium observatorium is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Lomatium observatorium Constance & Ertter
Common Name: Mt. Hamilton lomatium
Family:	Apiaceae
Element Code:	PDAPI1B2J0
USDA Plants Symbol:	LOOB3
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:	G1
State Rank:	S1
Other Status:	BLM_S; SB_CalBG/RSABG; SB_UCSC
CRPR Changes:
Add Date:	2001-01-01
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Mar-May

Elevation:
1219 - 1330 meters
4000 - 4365 feet

General Habitats:

Cismontane woodland

Microhabitat Details:

Microhabitat:

Notes

Notes: Possibly threatened by fire suppression and non-native plants. Not in TJM (1993). See Madroño 43(4):515 (1996) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	3
	Total EOs	% of EOs
EOs with Threat Listed:	2	50 %
Foot traffic/trampling	1	25%
Other	1	25%
Road/trail construction/maint.	1	25%

Occurrence Data from the CNDDB

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

Occurrence Status:
Historical >20 Years	4
Recent <=20 Years	0

Presence:
Presumed Extant	4
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

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

Quads: Name (Quad Code)
Isabel Valley (3712135), Lick Observatory (3712136), Mt. Boardman (3712144)

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