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Pinus contorta / Arnica cordifolia Forest | Western Ecology Working Group of...
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Name: Pinus contorta / Arnica cordifolia Forest Reference: Western Ecology Working Group of... Description: This association is found in the upper montane and subalpine zone of the central and northern Rocky Mountains. Stands typically occur on cool, dry sites on gentle to moderate slopes with variable aspects depending on elevation. Soils are well-drained, gravelly loams, silts or silty clay loams generally derived from acidic, noncalcareous parent materials. Ground cover is mostly litter, often with duff over 3 cm deep, but bare ground and rock cover may be significant in some stands (to 20% cover). The vegetation is characterized by a Pinus contorta-dominated tree canopy with Arnica cordifolia dominant in the understory. The tree canopy varies from moderately dense to nearly closed (40-90% cover) and is often solely dominated by Pinus contorta. However, in some stands scattered Abies lasiocarpa, Picea engelmannii, Pinus albicaulis, Pinus flexilis, Populus tremuloides, or Pseudotsuga menziesii trees may be present, especially in the subcanopy. Stands generally have a depauperate understory, which may include sparse shrub layers composed of scattered tree saplings, Ribes lacustre, Shepherdia canadensis, or Symphoricarpos oreophilus. Vaccinium scoparium is absent or rare. Arnica cordifolia (indicator species) generally dominates in the sparse to moderately dense herbaceous layer. Other frequent herbs include Antennaria racemosa, Astragalus miser, Chamerion angustifolium, Orthilia secunda (= Pyrola secunda), and Thalictrum occidentale.  Accession Code: VB.CC.19234.PINUSCONTORTAAR Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Nov-1997 to: 17-Nov-2014
	status: accepted Community's Parent: Pinus contorta Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Lodgepole Pine / Heartleaf Leopardbane Forest   Scientific: Pinus contorta / Arnica cordifolia Forest   UID: ELEMENT_GLOBAL.2.684389 NatureServe Explorer   Code: CEGL000135   Common: Lodgepole Pine / Heartleaf Arnica Forest (convergence) and Synonyms: (undetermined) Pinus contorta / Arnica cordifolia Forest