California Native Plant Society
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Chorizanthe robusta
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Robust Spineflower
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Chorizanthe robusta

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About Robust Spineflower (Chorizanthe robusta) Chorizanthe robusta is a species of flowering plant in the buckwheat family. It is endemic to California, where it is a rare, federally listed endangered species. C. robusta is variable in form, growing decumbent or erect and reaching a maximum length of half a meter. It is grayish in color and hairy. The inflorescence is made up of several flowers with each flower surrounded by white or pink bracts with hooked tips. The flower itself is just a few millimeters long and white to pink in color. Varieties: It is composed of two varieties:var. robusta, known generally as the robust spineflower, which is known only from southern Santa Cruz and Monterey Counties,var. hartwegii, the Scotts Valley spineflower, which is known from a few locations in Scotts Valley in Santa Cruz County. The plant is closely related to Chorizanthe pungens, another rare endemic from the area.
Plant Description
Plant Type
Annual herb

Flower Color
Pink, White

Native Status

Natural Setting
Elevation ?
2' - 1433'

Annual Precip. ?
10.8" - 49.2"

Summer Precip. ?
0.21" - 0.57"

Coldest Month ?
43.6° F - 51.3° F

Hottest Month ?
60.0° F - 76.5° F

Humidity ?
0.41 vpd - 23.25 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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