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CEGL000773 Pinus discolor / Quercus toumeyi Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Border Pinyon / Toumey Oak Woodland
Colloquial Name: Madrean Conifer Woodland
Hierarchy Level: Association
Type Concept: This Madrean conifer woodland occurs in the "Borderlands" region in southeastern Arizona and extreme southwestern New Mexico (Animas and Peloncillo mountains) and likely occurs in adjacent northern Mexico. Stands are small and patchy in distribution and limited to mountain and foothill slopes at elevations of 1800-1860 m, and are often found within a matrix of Quercus toumeyi chaparral. Soils are derived from rhyolite parent material. This late-successional woodland association has an open to moderately dense tree canopy (20-80% cover) codominated by the evergreen trees Pinus discolor and Juniperus deppeana, with occasional Juniperus coahuilensis, Juniperus monosperma, Quercus arizonica, or Quercus emoryi present. The moderately dense to dense shrub layer (>25% cover) is dominated by the broad-leaved evergreen oaks Quercus toumeyi, Quercus toumeyi x grisea hybrid, and includes many other shrub species such as Arctostaphylos pungens, Garrya wrightii, Nolina microcarpa, Agave palmeri, Rhus trilobata, Rhus virens, and Dasylirion wheeleri. The herbaceous layer is generally sparse and dominated by perennial grasses with scattered forbs. Species include Schizachyrium cirratum, Aristida schiedeana var. orcuttiana, Bouteloua curtipendula, Muhlenbergia emersleyi, Eragrostis intermedia, Bouteloua gracilis, Piptochaetium fimbriatum, Phaseolus spp., and Desmodium spp. The dominance of Quercus toumeyi in the shrub layer is diagnostic of this Pinus discolor woodland type.
Diagnostic Characteristics: A shrubby woodland on rhyolite parent materials occurring in southeastern Arizona and southwestern New Mexico. Quercus toumeyi or its hybrids are present. Pinus discolor, Juniperus deppeana, and Juniperus coahuilensis dominate the overstory.
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: Some stands reflect the late-successional stage transformation of interior chaparral to pinyon woodland. Moir (1979) described two Pinus discolor-dominated woodlands from the Peloncillo Mountains and an interior chaparral type that may fit the current concept of this association. The woodlands occur at higher elevations on mid to upper north-facing slopes above the Madrean oak woodlands and at lower elevations in the lower slopes and draws. These descriptions need further review.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: This late-successional woodland association has an open to moderately dense tree canopy (20-80% cover) codominated by the evergreen trees Pinus discolor and Juniperus deppeana dominate, with occasional Juniperus coahuilensis (= Juniperus erythrocarpa var. coahuilensis), Juniperus monosperma, Quercus arizonica, or Quercus emoryi present. The moderately dense to dense shrub layer (>25% cover) is dominated by the broad-leaved evergreen oaks Quercus toumeyi, Quercus toumeyi x grisea hybrid, and includes many other shrub species such as Arctostaphylos pungens, Garrya wrightii, Nolina microcarpa, Agave palmeri, Rhus trilobata, Rhus virens, and Dasylirion wheeleri. The herbaceous layer is generally sparse and dominated by perennial grasses with scattered forbs. Species include Schizachyrium cirratum, Aristida schiedeana var. orcuttiana (= Aristida orcuttiana), Bouteloua curtipendula, Muhlenbergia emersleyi, Eragrostis intermedia, Bouteloua gracilis, Piptochaetium fimbriatum, Phaseolus spp., and Desmodium spp. The dominance of Quercus toumeyi in the shrub layer is diagnostic of this Pinus discolor woodland type.
Dynamics: No Data Available
Environmental Description: Stands are small and patchy in distribution and limited to mountain and foothill slopes at elevations of 1800-1860 m, and are often found within a matrix of Quercus toumeyi chaparral. Soils are derived from rhyolite parent material.
Geographic Range: Only documented from the southwestern corner of New Mexico, but it probably occurs elsewhere in the "Borderlands" region of southeastern Arizona, southwestern New Mexico and northern Mexico.
Nations: MX?,US
States/Provinces: AZ, MXCHH?, NM
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689547
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: G2
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 | A3131 Mexican Pinyon - Border Pinyon - Two-needle Pinyon / Shrub Understory Woodland Alliance | A3131 | 1.B.1.Nd.1.c |
| Association | CEGL000773 Border Pinyon / Toumey Oak Woodland | CEGL000773 | 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: = Pinus discolor / Quercus toumeyi (Stuever and Hayden 1997b)
= Pinus discolor / Quercus toumeyi Woodland (Bassett et al. 1987)
= Pinus discolor / Quercus toumeyi Woodland (Bassett et al. 1987)
- 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., L. D. Engelking, H. C. Humphries, E. Muldavin, and W. H. Moir. 1995a. Assessing the conservation value of the Gray Ranch: Rarity, diversity and representativeness. Desert Plants 11(2-3):3-68.
- 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.
- Moir, W. H. 1979. Soil-vegetation patterns in the central Peloncillo Mountains, New Mexico. The American Midland Naturalist 102:317-331.
- Moir, W. H., and J. O. Carleton. 1987. Classification of pinyon-juniper (P-J) sites on national forests in the Southwest. Pages 216-226 in: R. L. Everett, editor. Proceedings of the Pinyon-Juniper Conference, Reno, NV, 13-16 January 1986. General Technical Report. USDA Forest Service, Intermountain Forest and Range Experiment Station, Ogden, UT. 581 pp.
- NHNM [Natural Heritage New Mexico]. No date. Unpublished data on file. Natural Heritage New Mexico, University of New Mexico, Albuquerque.
- Niering, W. A., and C. H. Lowe. 1984. Vegetation of the Santa Catalina Mountains: Community types and dynamics. Vegetatio 58:3-28.
- Stuever, M. C., and J. S. Hayden. 1997b. Plant associations of Arizona and New Mexico. Volume 2: Woodlands. USDA Forest Service, Southwestern Region, Habitat Typing Guides. 196 pp.
- USFS [U.S. Forest Service]. 1987b. Forest and woodland habitat types (plant associations) of Arizona south of the Mogollon Rim and southwestern New Mexico. USDA Forest Service, Southwestern Region, Albuquerque, NM. Second edition, 168 pp. plus insert.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.
- Willing, R. C. 1987. Status, distribution and habitat use of Gould''s turkey in the Peloncillo Mountains, New Mexico. Unpublished M.S. thesis, New Mexico State University, Las Cruces. 95 pp.