California Native Plant Society
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Chorizanthe biloba
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Twolobe Spineflower
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Chorizanthe biloba

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About Twolobe Spineflower (Chorizanthe biloba) Chorizanthe biloba is a species of flowering plant in the buckwheat family known by the common name twolobe spineflower. It is endemic to California, where it is known only from the Central Coast Ranges. There are two varieties, both of which are uncommon to rare. C. b. var. biloba is known from several areas of the Central Coast Ranges, including the foothills of the Santa Lucia Mountains and Diablo Range. It grows erect up to 40 centimeters tall. It produces an inflorescence of several flowers, each surrounded by six bracts tipped in hooked spines. The tiny flower has deeply notched or jagged tepals.
Plant Description
Plant Type
Annual herb

Max. Height
0.16 - 1.3 ft (0.05 - 0.4 m)

Flower Color

Native Status

Natural Setting
Elevation ?
251' - 6520'

Annual Precip. ?
6.1" - 41.7"

Summer Precip. ?
0.16" - 1.39"

Coldest Month ?
38.7° F - 50.2° F

Hottest Month ?
56.8° F - 78.8° F

Humidity ?
0.95 vpd - 26.94 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

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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