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Pinus contorta / Arnica cordifolia Forest | NatureServe Biotics 2019
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Name: Pinus contorta / Arnica cordifolia Forest Reference: NatureServe Biotics 2019 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 <i>Pinus contorta</i>-dominated tree canopy with <i>Arnica cordifolia</i> dominant in the understory. The tree canopy varies from moderately dense to nearly closed (40-90% cover) and is often solely dominated by <i>Pinus contorta</i>. However, in some stands scattered <i>Abies lasiocarpa, Picea engelmannii, Pinus albicaulis, Pinus flexilis, Populus tremuloides</i>, or <i>Pseudotsuga menziesii</i> 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, <i>Ribes lacustre, Shepherdia canadensis</i>, or <i>Symphoricarpos oreophilus</i>. <i>Vaccinium scoparium</i> is absent or rare. <i>Arnica cordifolia</i> (indicator species) generally dominates in the sparse to moderately dense herbaceous layer. Other frequent herbs include <i>Antennaria racemosa, Astragalus miser, Chamerion angustifolium, Orthilia secunda</i>, and <i>Thalictrum occidentale</i>.  Accession Code: urn:lsid:vegbank.org:commConcept:29044-{4972256F-7EE5-4BAF-B8E6-ED39100ADADB} Plot-observations of this Community Concept: 1
	Party Perspective according to: NatureServe (organization) Perspective from: 03-Mar-2004 to: ongoing
	status: accepted Community's Parent: Pinus contorta Rocky Mountain Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684389 NatureServe Explorer   Code: CEGL000135   Translated: Lodgepole Pine / Heartleaf Leopardbane Forest   Scientific: Pinus contorta / Arnica cordifolia Forest (convergence) and Synonyms: (similar) CEGL000135 (similar) Pinus contorta / Arnica cordifolia Forest (similar) Pinus contorta / Arnica cordifolia Forest