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Mat Rockspirea
Petrophytum caespitosum
  
About Mat Rockspirea (Petrophytum caespitosum) 1 Nurseries Carry This Plant Petrophyton caespitosum (orth. var. Petrophytum caespitosum) is a species of flowering plant in the rose family known by the common name mat rock spiraea. It is native to the western United States where it grows in mountainous areas from the Sierra Nevada to the Rocky Mountains. It grows among rocks in forested and woodland habitat. This is a very low matted shrub growing in carpets up to 80 centimeters wide, creeping over rocks. The plant often grows on vertical surfaces and hangs by its roots, which cling to cracks in rock. The stems are thick and very short, covered densely in rosettes of oval leaves. It produces many flower clusters which are spikelike clusters of flowers arising on erect peduncles up to 10 centimeters tall. Each flower cluster is packed with flowers, each with five tiny white petals, many whiskery stamens, and usually 5 hairy pistils. The flower parts dry and may fall away, leaving a cluster of developing fruits, follicles containing the seeds.
Plant Description
Plant Type
Plant Type
Shrub

Size
Size
11.8 - 4 in tall

Flower Color
Flower Color
White

Landscaping Information
Sun
Sun
Part Shade

Nurseries
Nurseries

Ease of Care
Ease of Care
Moderately Easy

Common uses
Common uses
Butterfly Gardens

Natural Setting
Climate
Climate
Annual Precipitation: 14.1" - 35.6", Summer Precipitation: 0.76" - 2.87", Coldest Month: 24.3" - 43.6", Hottest Month: 46.6" - 69.7", Humidity: 2.10" - 20.62", Elevation: 3130" - 10378"

Alternative Names
Common Names: Mat Rock Spiraea, Tufted Rockmat


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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