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Alnus rubra - Acer macrophyllum Forest Alliance | NatureServe Biotics 2019
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Name: Alnus rubra - Acer macrophyllum Forest Alliance Reference: NatureServe Biotics 2019 Description: This alliance contains communities dominated by <i>Acer macrophyllum</i> and/or <i>Alnus rubra</i>. Some conifers, such as <i>Abies grandis, Picea sitchensis, Pseudotsuga menziesii, Thuja plicata</i>, or <i>Tsuga heterophylla</i> may be present, and can usually be found growing in the understory or as occasional canopy trees, but never have more than 25% relative cover. Other deciduous trees, such as <i>Cornus nuttallii</i> and <i>Betula papyrifera</i> (which is sometimes codominant in northwestern Washington), may also be present in the tree stratum. The forest understory is usually species-rich and well-developed compared to adjacent conifer forests in the same area. Common shrub species in stands of this type include <i>Acer circinatum</i> (which is always present), <i>Gaultheria shallon, Mahonia nervosa, Menziesia ferruginea, Rubus parviflorus, Rubus spectabilis, Sambucus racemosa var. melanocarpa</i>, and <i>Vaccinium membranaceum</i>. The herbaceous layer is often well-developed, with <i>Oxalis oregana</i> and <i>Stachys mexicana</i> particularly common. Ferns can be an abundant component. Species include <i>Polystichum munitum, Athyrium filix-femina</i>, and <i>Pteridium aquilinum</i>. This alliance is found from northwestern British Columbia south along the coastal front and interior valleys to northern California. This maritime-influenced region receives annual precipitation ranging from 75-400 cm, mostly as winter rain. Vegetation within this alliance usually occurs along low-elevation (0-1000 m [0-3300 feet]) valley slopes and lower mountain slopes, often forming a seral community in moist coniferous forests.  Accession Code: urn:lsid:vegbank.org:commConcept:38672-{0B695349-BCE8-4947-8116-D93F7B65A141} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 18-Dec-2014 to: ongoing
	status: accepted Community's Parent: Alnus rubra - Acer macrophyllum Rainforest Group This Community's Level: Alliance This Community's Children: Show/Hide   Acer macrophyllum / Acer circinatum Forest   Acer macrophyllum - Alnus rubra / Polystichum munitum - Tellima grandiflora Forest   Acer macrophyllum / Carex deweyana Forest   Alnus rubra / Polystichum munitum Forest   Betula papyrifera var. papyrifera - Alnus rubra / Polystichum munitum Forest		Names:   UID: ELEMENT_GLOBAL.2.899509 NatureServe Explorer   Code: A3385   Translated: Red Alder - Bigleaf Maple Forest Alliance   Common: Red Alder - Bigleaf Maple Forest   Scientific: Alnus rubra - Acer macrophyllum Forest Alliance