Print Report

CEGL000799 Pinus engelmannii / Muhlenbergia longiligula Woodland

Type Concept Sentence: No Data Available


Common (Translated Scientific) Name: Apache Pine / Long-tongue Muhly Woodland

Colloquial Name: No Data Available

Hierarchy Level:  Association

Type Concept: This highly diverse "Madrean" woodland association is restricted to the isolated "sky island" mountain ranges of southern Arizona and northern Mexico and possibly occurs in the Animas Mountains of southwestern New Mexico. In the U.S., it is known only from the Canelo Hills and the Santa Rita and the Chiricahua mountains, but it may be more prevalent in Mexico. This association occurs on moderate to steep slopes of northerly aspects or on benches. Elevations range from 1700-2100 m (5560-6900 feet), and sites are warm and dry. The association is characterized by an open canopy of Pinus engelmannii with Pinus cembroides, Pinus edulis, or Juniperus deppeana in the understory. Quercus emoryi, Quercus arizonica, or Quercus gambelii may be common to well-represented as shrubs. The herb layer is characteristically grassy, with Muhlenbergia longiligula well-represented and dominant. Muhlenbergia emersleyi and Panicum bulbosum may also be well-represented, but the remainder of the herbs are sparse and scattered.

Diagnostic Characteristics: Pinus engelmannii is present and not accidental, and Quercus hypoleucoides and Quercus rugosa are poorly represented and subdominant or absent. Muhlenbergia longiligula is usually present, although this grass may not be present in all locations within this plant association.

Rationale for Nominal Species or Physiognomic Features: No Data Available

Classification Comments: This a broadly defined association. Three tentative phases have been identified that may be elevated to association with new data: (1) an upper-elevation typical Muhlenbergia longiligula phase where Muhlenbergia longiligula and Panicum bulbosum are well-represented and Quercus gambelii is common; (2) an intermediate-elevation Quercus arizonica phase, with Piptochaetium fimbriatum common; and (3) a low-elevation Quercus emoryi phase, where Muhlenbergia longiligula and Muhlenbergia emersleyi codominate in the herb layer (Stuever and Hayden 1997a).

Similar NVC Types: No Data Available
note: No Data Available

Physiognomy and Structure: No Data Available

Floristics: The association is characterized by an open canopy of Pinus engelmannii with Pinus cembroides, Pinus edulis, or Juniperus deppeana in the understory. Quercus emoryi, Quercus arizonica, or Quercus gambelii may be common to well-represented as shrubs. The herb layer is characteristically grassy, with Muhlenbergia longiligula well-represented and dominant. Muhlenbergia emersleyi and Panicum bulbosum may also be well-represented, but the remainder of the herbs are sparse and scattered.

Dynamics:  No Data Available

Environmental Description:  This association occurs on moderate to steep slopes of northerly aspects or on benches. Elevations range from 1700-2100 m (5560-6900 feet), and sites are warm and dry.

Geographic Range: This highly diverse "Madrean" woodland association is restricted to the isolated "sky island" mountain ranges of southern Arizona and northern Mexico and possibly occurs in the Animas Mountains of southwestern New Mexico. In the U.S., it is known only from the Canelo Hills and the Santa Rita and the Chiricahua mountains, but it may be more prevalent in Mexico.

Nations: MX,US

States/Provinces:  AZ, MXSON, NM?




Confidence Level: Low

Confidence Level Comments: No Data Available

Grank: G3

Greasons: No Data Available


Concept Lineage: No Data Available

Predecessors: No Data Available

Obsolete Names: No Data Available

Obsolete Parents: No Data Available

Synonomy: = Pinus engelmannii / Muhlenbergia longiligula (Stuever and Hayden 1997a)
= Pinus engelmannii / Muhlenbergia longiligula Habitat Type (Muldavin et al. 1987)
= Pinus engelmannii / Muhlenbergia longiligula Habitat Type (Muldavin et al. 1996) [3 phases are described]

Concept Author(s): Muldavin et al. (1996)

Author of Description: E. Muldavin

Acknowledgements: No Data Available

Version Date: 10-18-18

  • Baisan, C. H., and T. W. Swetnam. 1990. Fire history on a desert mountain range: Rincon Mountain Wilderness, Arizona, U.S.A. CCanadian Journal of Forestry Research 20:1559-1569.
  • 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.
  • Muldavin, E. H., R. L. DeVelice, and F. Ronco, Jr. 1996. A classification of forest habitat types of southern Arizona and portions of the Colorado Plateau. General Technical Report RM-GTR-287. USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, CO. 130 pp.
  • Muldavin, E., R. DeVelice, and W. Dick-Peddie. 1987. Forest habitat types of the Prescott, Tonto and western Coronado national forests, Arizona. Unpublished final report prepared for Rocky Mountain Forest and Range Experiment Station, CO. 71 pp.
  • Pavek, D. S. 1994e. Pinus engelmanni. In: Fire Effects Information System [Online]. USDA Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). [http://www.fs.fed.us/database/feis/] (accessed 31 August 2015).
  • Stuever, M. C., and J. S. Hayden. 1997a. Plant associations of Arizona and New Mexico, edition 3. Volume 1: Forests. USDA Forest Service, Southwestern Region. Habitat Typing Guides. 291 pp.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.