Species Details

Chorizanthe howellii

Howell's spineflower

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Scientific Name:
Chorizanthe howellii Goodm.
Common Name:
Howell's spineflower
Family: Polygonaceae
Element Code: PDPGN040C0
USDA Plants Symbol: CHHO2
Synonyms/Other Names:
Lifeform: annual herb
Blooming Period: May-Jul
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Elevation:
0 - 45 meters
0 - 150 feet
General Habitats:
  • Coastal dunes
  • Coastal prairie
  • Coastal scrub
Microhabitat Details:
Microhabitat:
  • Disturbed areas (often)
  • Sandy
Notes:
Known only from north of Ft. Bragg. Threatened by development, foot traffic, recreational activities, vehicles, and non-native plants. Potentially threatened by trail construction. Closely related to C. pungens. See Annals of the Missouri Botanical Garden 21:44 (1934) for original description, and Phytologia 66(2):131-132 (1989) for taxonomic treatment.
Threats:
Taxonomy:
Threat List Total: 8
Total EOs % of EOs
EOs with Threat Listed: 8 89 %
THREAT LIST:
Foot traffic/trampling 5 55%
Other 5 55%
Recreational use (non-ORV) 4 44%
Non-native plant impacts 3 33%
Development 2 22%
Total Occurrences: 9
Element Occurrence Ranks:
A B C D X U
0 6 0 0 0 3
Occurrence Status:
Historical >20 Years 3
Recent <=20 Years 6
Presence:
Presumed Extant 9
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Mendocino (MEN)
Quads: Name (Quad Code)
Fort Bragg (3912347), Inglenook (3912357), Mendocino (3912337)
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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