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CEGL000769 Pinus (discolor, cembroides) / Quercus arizonica / Muhlenbergia emersleyi Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: (Border Pinyon, Mexican Pinyon) / Arizona White Oak / Bullgrass Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This diverse Madrean woodland savanna association is known from the Borderlands area of southeastern Arizona and southwestern New Mexico, and in the Sierra Del Carmen of northeastern Coahuila, Mexico (and potentially in Big Bend National Park in Texas). It occurs from about 1650 to 2060 m (5400-6750 feet) elevation on gentle to steep hillslopes of northerly aspects. Stands are characterized by moderately open canopies (30-60% cover) of Pinus cembroides or Pinus discolor in association with the evergreen oaks Quercus arizonica or Quercus grisea. Juniperus deppeana is usually present but not dominant. The understory is diverse (96 species have been recorded for the association), grassy, and dominated by Muhlenbergia emersleyi. Other common grasses include Piptochaetium fimbriatum, Schizachyrium cirratum, and Bouteloua curtipendula.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: Nomenclature changes in the taxonomy of Pinus cembroides Zucc. are unclear and confusing. Pinus cembroides Zucc. var. bicolor Little was renamed Pinus discolor D.K. Bailey & Hawksworth and raised to the species level (Kartesz 1999). Both are still recognized by Kartesz (1999). The eastern Sierra Madre representatives of this type may be different from those of the western Sierra Madre. This is because Pinus cembroides occurs in New Mexico and Texas, and Pinus discolor occurs in New Mexico and Arizona. We have retained both taxa in the name of the type until further clarification on them is available.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Stands are characterized by moderately open canopies (30-60% cover) of Pinus cembroides or Pinus discolor in association with the evergreen oaks Quercus arizonica or Quercus grisea. Juniperus deppeana is usually present but not dominant. The understory is diverse (96 species have been recorded for the association), grassy, and dominated by Muhlenbergia emersleyi. Other common grasses include Piptochaetium fimbriatum, Schizachyrium cirratum, and Bouteloua curtipendula.
Dynamics: No Data Available
Environmental Description: It occurs from about 1650 to 2060 m (5400-6750 feet) elevation on gentle to steep hillslopes of northerly aspects.
Geographic Range: This woodland savanna association is known from the Borderlands area of southeastern Arizona and southwestern New Mexico, and in the Sierra Del Carmen of northeastern Coahuila, Mexico (and potentially in Big Bend National Park). It may occur elsewhere in southwestern New Mexico, southeastern Arizona, and northern Mexico.
Nations: MX,US
States/Provinces: AZ, MXCOA, MXSON?, NM, TX?
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.687064
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: G3
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 1 Forest & Woodland Class | C01 | 1 |
| Subclass | 1.B Temperate & Boreal Forest & Woodland Subclass | S15 | 1.B |
| Formation | 1.B.1 Warm Temperate Forest & Woodland Formation | F018 | 1.B.1 |
| Division | 1.B.1.Nd Madrean-Balconian Forest & Woodland Division | D060 | 1.B.1.Nd |
| Macrogroup | 1.B.1.Nd.1 Alligator Juniper - Mexican Pinyon - Arizona White Oak Madrean Lowland Evergreen Woodland Macrogroup | M010 | 1.B.1.Nd.1 |
| Group | 1.B.1.Nd.1.c Mexican Pinyon - Border Pinyon - Redberry Juniper Woodland Group | G200 | 1.B.1.Nd.1.c |
| Alliance | A3132 Mexican Pinyon - Border Pinyon - Two-needle Pinyon / Grass Understory Woodland Alliance | A3132 | 1.B.1.Nd.1.c |
| Association | CEGL000769 (Border Pinyon, Mexican Pinyon) / Arizona White Oak / Bullgrass Woodland | CEGL000769 | 1.B.1.Nd.1.c |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: No Data Available
- Bassett, D., M. Larson, and W. Moir. 1987. Forest and woodland habitat types of Arizona south of the Mogollon Rim and southwestern New Mexico. Edition 2. USDA Forest Service, Southwestern Region, Albuquerque, NM.
- Bourgeron, P. S., L. D. Engelking, H. C. Humphries, E. Muldavin, and W. H. Moir. 1993b. Assessing the conservation value of the Gray Ranch: Rarity, diversity and representativeness. Unpublished report prepared for The Nature Conservancy by the Western Heritage Task Force, Boulder, CO. (Volume I and II).
- Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.
- Kartesz, J. T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: J. T. Kartesz and C. A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, NC.
- NHNM [Natural Heritage New Mexico]. No date. Unpublished data on file. Natural Heritage New Mexico, University of New Mexico, Albuquerque.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.
- Wood, S., G. Harper, E. Muldavin, and P. Neville. 1999. Vegetation map of the Sierra del Carmen, U.S.A. and Mexico. Final report submitted to Big Bend National Park by the New Mexico Natural Heritage Program, University of New Mexico, Albuquerque, NM. 57 pp.