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Arctostaphylos myrtifolia

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About Ione Manzanita (Arctostaphylos myrtifolia) Arctostaphylos myrtifolia is a species in the Ericaceae (Heath) family known by the common name Ione Manzanita. It is a rare species, endemic to the Sierra Nevada foothills of California where it grows in the chaparral and woodland on a distinctive acidic soil series in western Amador and Calaveras Counties. For this reason it is included on CNPS list 1B.2 and is listed by the federal government as Threatened. This is a red-barked, bristly shrub reaching just over a meter in maximum height. The small bright green leaves are coated in tiny hairy hairs and are shiny but rough in texture. They are less than 2 centimeters long. The flower cluster is a raceme of urn-shaped manzanita flowers on bright red branches. The fruit is a cylindrical drupe only a few millimeters long. A major threat to this rare endemic plant is a pair of fungal diseases. A branch canker caused by species of Fusicoccum, including F. aesculi, causes some mortality, and root and crown rot caused by Phytophthora cinnamomi has destroyed entire stands of the manzanita and prevented its regrowth in patches of infested soil.
Plant Description
Plant Type

Max. Height
2 - 4 ft (0.6 - 1.2 m)


Flower Color
Pink, White, Red

Flowering Season
Spring, Winter

Native Status
Natural Setting
Site Type
Acid sand, clay soils

Sun, Part Shade

Elevation ?
76' - 6884'

Annual Precip. ?
16.9" - 53.7"

Summer Precip. ?
0.26" - 2.21"

Coldest Month ?
32.4° F - 49.4° F

Hottest Month ?
57.5° F - 75.0° F

Humidity ?
0.70 vpd - 22.85 vpd

Soil Description
This plant requires sandy-clay soil. often underlain by hardpan

Fast, Medium, Slow

Landscaping Information
Ease of Care
Moderately Easy

Water Requirement ?
Extremely Low
Very Low
Moderate - High

Common uses
Hummingbird Gardens, Bee Gardens

Nursery Availability
Rarely 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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