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Pinus discolor / Muhlenbergia emersleyi Woodland | NatureServe Biotics 2019
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Name: Pinus discolor / Muhlenbergia emersleyi Woodland Reference: NatureServe Biotics 2019 Description: This woodland association occurs in southeastern Arizona, southern New Mexico, and likely in adjacent Mexico. Stands occur on gently to moderately sloping alluvial plains, bajadas and canyon bottoms to steep rocky slopes in canyons, piedmont hills and mountains. Elevation ranges from 1460-2010 m (4780-6600 feet). Soils are shallow, gravelly or stony sandy loams or sandy clay loams, derived from a mixture of alluvium and colluvium. The vegetation is characterized by an open to moderately dense tree layer (15-70% cover) dominated by <i>Pinus discolor</i> and <i>Juniperus deppeana</i>. Evergreen oaks are often present in the tree subcanopy but generally have lower cover. An open shrub layer may be present, but the understory is typically dominated by the graminoid layer. The tree canopy ranges from 3 m to over 5 m tall. Stands range from open woodlands to moderately dense woodlands at higher elevations and in canyon bottoms. Other canopy trees are <i>Quercus arizonica, Quercus emoryi</i>, or <i>Quercus grisea</i>. A sparse to moderately dense shrub layer may be present, but graminoids dominate the understory. Characteristic shrubs and succulents include <i>Acacia angustissima, Arctostaphylos pungens, Cercocarpus montanus, Dasylirion wheeleri, Fendlera rupicola, Garrya wrightii, Nolina microcarpa, Quercus toumeyi, Rhus trilobata, Yucca baccata</i>, and <i>Yucca madrensis</i>. The graminoid layer is moderate to dense (25-80% cover) and is typically dominated by medium-tall bunchgrasses such as <i>Bouteloua curtipendula, Eragrostis intermedia</i>, or <i>Muhlenbergia emersleyi</i>, but it can be very diverse with both forbs and grasses.  Accession Code: urn:lsid:vegbank.org:commConcept:29676-{625A2D8D-3C93-40E5-A6BD-5CB63D9E8347} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Oct-2018 to: ongoing
	status: accepted Community's Parent: Pinus cembroides - Pinus discolor - Pinus edulis / Grass Understory Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.684660 NatureServe Explorer   Code: CEGL000767   Translated: Border Pinyon / Bullgrass Woodland   Scientific: Pinus discolor / Muhlenbergia emersleyi Woodland (convergence) and Synonyms: (similar) CEGL000767 (similar) Pinus discolor / Muhlenbergia emersleyi Woodland (similar) Pinus discolor / Muhlenbergia emersleyi Woodland