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Rock Crossosoma
Crossosoma bigelovii

About Rock Crossosoma (Crossosoma bigelovii) Crossosoma bigelovii is one of only a few species in the flowering plant family Crossosomataceae. It is known by the common name ragged rockflower and it is native to the Mojave and Sonoran Deserts of North America. It is a shrub growing one to two meters tall. It is intricately divided into thorn-tipped branches lined with clusters of small, deciduous, gray-green leaves no longer than about 1.5 centimeters. The flower cluster bears a single flower, which has white to purple-tinged petals about a centimeter long and narrowing to claws at their bases.
Plant Description
Plant Type

Max. Height
3.3 - 7 ft (1 - 2.1 m)

Winter Deciduous

Flower Color
White, Purple

Native Status

Natural Setting
Site Type
Dry, rocky slopes and canyons

Sun, Part Shade

Elevation ?
220' - 5594'

Annual Precip. ?
3.8" - 15.2"

Summer Precip. ?
0.28" - 2.69"

Coldest Month ?
42.4° F - 59.4° F

Hottest Month ?
66.5° F - 87.6° F

Humidity ?
2.21 vpd - 38.38 vpd

Sunset Zones ?
13, 14, 18, 19, 20, 21

Landscaping Information
Propagation ?
For propagating by seed: No treatment.

Common uses

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Bigelow's Crossosoma, Ragged Rock Flower, Ragged Rockflower

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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