Species Details

Euphorbia hooveri

Hoover's spurge

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Classification

Scientific Name: Euphorbia hooveri L.C. Wheeler
Common Name: Hoover's spurge
Family:	Euphorbiaceae
Element Code:	PDEUP0D150
USDA Plants Symbol:
Synonyms/Other Names: Chamaesyce hooveri (Wheeler) Koutnik

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	FT (1997-03-26)
State List:	None
Global Rank:	G1
State Rank:	S1
Other Status:
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb

Blooming Period: Jul-Sep(Oct)

Elevation:
25 - 250 meters
80 - 820 feet

General Habitats:

Vernal pools

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by grazing, agriculture, and non-native plants. See Proceedings of the Biological Society of Washington 53:9 (1940) for original description, Madroño 32(3):187-189 (1985) for alternative nomenclature, and Taxon 55:397-420 (2006) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	12
	Total EOs	% of EOs
EOs with Threat Listed:	23	79 %
Grazing	19	65%
Non-native plant impacts	6	20%
Agriculture	5	17%
Altered flood/tidal/hydrologic regime	4	13%
Foot traffic/trampling	4	13%
Erosion/runoff	3	10%
Biocides	1	3%
Development	1	3%
Disking	1	3%
Other	1	3%
Recreational use (non-ORV)	1	3%
Surface water diversion	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					29
A	B	C	D	X	U
2	7	9	2	4	5

Occurrence Status:
Historical >20 Years	16
Recent <=20 Years	13

Presence:
Presumed Extant	25
Possibly Extirpated	2
Presumed Extirpated	2

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Butte (BUT), Glenn (GLE), Merced (MER), Stanislaus (STA), Tehama (TEH), Tulare (TUL)

Quads: Name (Quad Code)
Cooperstown (3712065), Hamlin Canyon (3912166), Ivanhoe (3611942), Logandale (3912242), Monson (3611943), Montpelier (3712056), Nord (3912178), Richardson Springs NW (3912188), Turlock Lake (3712055), Turner Ranch (3712026), Vina (3912281)

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