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Arctostaphylos myrtifolia Shrubland | NatureServe Biotics 2019
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Name: Arctostaphylos myrtifolia Shrubland Reference: NatureServe Biotics 2019 Description: This vegetation type is found in the western foothills of the Sierra Nevada, at elevations ranging from 100 to 300 m. The region where it occurs is directly to the east of the Golden Gate and San Francisco Bay, where maritime air masses can pass into the Central Valley. This is a low, heath-like chaparral vegetation type composed of shrubs less than 1 m in height and scattered forbs. The broad-leaved evergreen shrub <i>Arctostaphylos myrtifolia</i> dominates, and sometimes is the only shrub present. In mature stands, cover of shrubs usually exceeds 50%. Other shrubs that may be present include <i>Adenostoma fasciculatum, Frangula californica ssp. tomentella, Quercus berberidifolia, Quercus wislizeni, Arctostaphylos viscida</i>, and <i>Ceanothus tomentosus</i>. The herbaceous layer is sparse, but may include the forbs <i>Lotus scoparius, Eriogonum apricum</i> and <i>Helianthemum scoparium</i>. A layer of both mosses and lichens is present. The climate is dry and hot in summer, with prolonged periods of intense heat. However, the influence of maritime air results in summer high temperatures that are less intense than elsewhere in the Sierra Nevada foothills. Winters are cool and moist. Annual precipitation ranges from 53 cm to slightly over 80 cm, and most occurs during the winter months as rain. Frosts are infrequent and slight. Relative humidities are high enough to support epiphytic lichens. This vegetation type is restricted to outcrops of the Eocene Ione Formation or sediments derived from this formation. The formation is composed of kaolinitic clay minerals, quartz sand, and ironstone. The soils are strongly acidic, shallow, nutrient-poor and relatively coarse in texture. Sites supporting this type include exposed southerly slopes and ridgetops, as well as gullies and washes. This association requires fire, both for regeneration and to prevent shading from surrounding chaparral types.  Accession Code: urn:lsid:vegbank.org:commConcept:31910-{1489BFAF-33B4-4595-8BCA-81908596A0D7} Plot-observations of this Community Concept: 13
	Party Perspective according to: NatureServe (organization) Perspective from: 11-Jun-2008 to: ongoing
	status: accepted Community's Parent: Arctostaphylos viscida - Arctostaphylos myrtifolia - Arctostaphylos manzanita Chaparral Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688818 NatureServe Explorer   Code: CEGL003009   Translated: Ione Manzanita Shrubland   Scientific: Arctostaphylos myrtifolia Shrubland (convergence) and Synonyms: (similar) CEGL003009 (similar) Arctostaphylos myrtifolia Shrubland (similar) Arctostaphylos myrtifolia Shrubland [Placeholder]