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Chorizanthe howellii
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Howell's Spineflower
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Chorizanthe howellii

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About Howell's Spineflower (Chorizanthe howellii) 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.
Plant Description
Plant Type
Annual herb

Max. Height
1.2 - 4 in (3 - 10.2 cm)

Flower Color

Native Status
Natural Setting
Elevation ?
9' - 179'

Annual Precip. ?
39.0" - 44.0"

Summer Precip. ?
0.69" - 0.80"

Coldest Month ?
45.6° F - 46.6° F

Hottest Month ?
58.7° F - 61.0° F

Humidity ?
0.09 vpd - 7.41 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Mendocino Spineflower

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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