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Catalina Crossosoma
Crossosoma californicum

About Catalina Crossosoma (Crossosoma californicum) Crossosoma californicum, known by the common name California rockflower, is one of only a few species in the flowering plant family Crossosomataceae. Crossosoma californicum is native to San Clemente and Santa Catalina Islands, two of the Channel Islands of California, as well as Guadalupe Island off the coast of Baja California. It is also known from one location on the mainland California coast at the Portuguese Bend Nature Preserve, on the Palos Verdes Peninsula of Los Angeles County. Crossosoma californicum is a shrub or small tree sprawling to a maximum height of 5 metres (16 ft). The stem is intricately divided into many thorn-tipped branches lined with veiny, pale green, oval-shaped to rounded leaves up to 9 centimeters long. The species produces solitary flowers with round white petals, each one to 1. 5 centimeters long. At the center are numerous of stamens and 1-5 free carpels
Plant Description
Plant Type

Max. Height
16.4 ft (5 m)

Flower Color
White, Green

Native Status
Natural Setting
Elevation ?
4' - 1875'

Annual Precip. ?
8.4" - 28.4"

Summer Precip. ?
0.20" - 0.64"

Coldest Month ?
48.5° F - 57.3° F

Hottest Month ?
66.1° F - 79.9° F

Humidity ?
1.55 vpd - 29.51 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
California 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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