Chorizanthe howellii - Earth.com
chorizanthe howellii
12-22-2016

Chorizanthe howellii

Chorizanthe howellii NatureServe Explorer Species Reports — NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

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Chorizanthe howellii is a species of flowering plant in the buckwheat family known by the common names Mendocino spineflower and Howell’s spineflower. It is endemic to coastal Mendocino County, California, where it is known only from the sand dunes and coastal scrub near Fort Bragg. It is estimated that 95% of the remaining individuals of this plant are part of a single population growing at MacKerricher State Park. It is a federally listed endangered species.

This is a decumbent or spreading species, growing hairy stems along the ground up to about 10 centimeters long. The inflorescence is a cluster of flowers, each surrounded by a starlike array of six spreading white bracts tipped with straight brown awns. The flower itself is a few millimeters wide and white to pale pink in color

Detailed information
Full Name: Howell's spineflower (Chorizanthe howellii)
Where found: Wherever found
Critical Habitat:N/A
Species Group:Flowering Plants
Current listing status
Status Date Listed Lead Region Where Listed
Endangered 06/22/1992 California/Nevada Region (Region 8) Wherever found
  • States/US Territories in which the Howell's spineflower, Wherever found is known to or is believed to occur: California
  • US Counties in which the Howell's spineflower, Wherever found is known to or is believed to occur: View All
Federal register documents
Date
Citation Page
Title
04/27/2012 77 FR 25112 25116 5-Year Reviews of Species in California and Nevada
05/25/2011 76 FR 30377 30382 Initiation of 5-Year Reviews of Species in California, Nevada, and the Klamath Basin of Oregon
03/05/2008 73 FR 11945 11950 Initiation of 5-Year Reviews of 58 Species in California and Nevada; Availability of Completed 5-Year Reviews in California, Nevada and Southern Oregon
03/22/2006 71 FR 14538 14542 Initiation of 5-Year Reviews of 56 Species in California and Nevada: Notice of review.
06/22/1992 57 FR 27848 27859 ETWP; Six Plants and Myrtle's Silverspot Butterfly from Coastal Dunes in Northern and Central California Determined to Be Endangered; 57FR 27848 27858
03/22/1991 56 FR 12317 12326 ETWP; Six Plants and Speyeria zerene myrtleae (Myrtle's Silverspot Butterfly) From Coastal Dunes in Northern and Central California Proposed as Endangered; 56 FR 12317 12326
Recovery
No critical habitat rules have been published for the Howell's spineflower.
Date
Title
Plan Action Status
Plan Status
09/29/1998 Seven Coastal Plants and the Myrtle's Silverspot Butterfly Recovery Plan View Implementation Progress Final
Date
Title
Plan Action Status
Plan Status
09/29/1998 Seven Coastal Plants and the Myrtle's Silverspot Butterfly Recovery Plan View Implementation Progress Final
Date
Citation Page
Title
Document Type
04/27/2012 77 FR 25112 25116 5-Year Reviews of Species in California and Nevada
  • Notice 5-year Review, Completion
05/25/2011 76 FR 30377 30382 Initiation of 5-Year Reviews of Species in California, Nevada, and the Klamath Basin of Oregon
  • Notice 5-year Review, Initiation
03/05/2008 73 FR 11945 11950 Initiation of 5-Year Reviews of 58 Species in California and Nevada; Availability of Completed 5-Year Reviews in California, Nevada and Southern Oregon
  • Notice 5-year Review, Completion
03/22/2006 71 FR 14538 14542 Initiation of 5-Year Reviews of 56 Species in California and Nevada: Notice of review.
  • Notice 5-year Review
Date
Title
12/06/2011 Chorizanthe howellii (Howell's spineflower) 5-Year Review - 2011
09/24/2007 Howell's Spineflower 5-Year Review
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