Taxon Details

Euphorbia hooveri

Hoover's spurge

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Photo of Euphorbia hooveri
© 2020 Neal Kramer
Photo of Euphorbia hooveri
© 2020 Neal Kramer
Photo of Euphorbia hooveri
© 2020 Neal Kramer

Taxon Summary:

Euphorbia hooveri, commonly known as Hoover's spurge, is a annual herb in the Euphorbiaceae that is found only in California. It occurs within Vernal pools, growing at elevations from 25 to 250 meters. Euphorbia hooveri is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

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 Total: 12
Total EOs % of EOs
EOs with Threat Listed: 23 79 %
THREAT LIST:
Grazing 19 65%
Non-native plant impacts 6 20%
Agriculture 5 17%
Altered flood/tidal/hydrologic regime 4 13%
Foot traffic/trampling 4 13%
Total Occurrences: 29
Element Occurrence Ranks:
A B C D X U
2 7 9 2 4 5
Occurrence Status:
Historical >20 Years 17
Recent <=20 Years 12
Presence:
Presumed Extant 25
Possibly Extirpated 2
Presumed Extirpated 2
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.
Presumed Extant
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