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CEGL000771 Pinus discolor / Quercus hypoleucoides Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Border Pinyon / Silverleaf Oak Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This Madrean conifer woodland occurs the Animas, Peloncillo, Chiricahua and Santa Catalina mountains in the "Borderlands" region of southwestern New Mexico and southeastern Arizona, and probably occurs in the mountains of adjacent northern Mexico. Stands are small and patchy and limited to elevated plains, mountain and foothills slopes, and ridgetops. Elevation ranges from 1890-2130 m. Soils are shallow and rocky, often with rock outcrops. This late-successional woodland association has an open tree canopy (>25% cover), codominated by the evergreen trees Pinus discolor and Juniperus deppeana, with occasional Pinus ponderosa or Pinus leiophylla present. The moderately dense to dense shrub layer (>25% cover) is dominated by the broad-leaved evergreen oaks Quercus hypoleucoides and Quercus rugosa, but includes many other shrub species such as Arctostaphylos pringlei, Arctostaphylos pungens, Garrya wrightii, Nolina microcarpa, Agave parryi, Rhus trilobata, and Quercus gambelii. The herbaceous layer is generally sparse and composed of mixed grass and forb species including Aristida schiedeana var. orcuttiana, Bouteloua curtipendula, Elymus arizonicus, Muhlenbergia emersleyi (low elevations), Geranium caespitosum, and Thalictrum fendleri. The presence of Quercus hypoleucoides in a moderately dense shrub layer is diagnostic of this Pinus discolor woodland type.
Diagnostic Characteristics: Pinus discolor and Juniperus deppeana dominate the overstory, and Pinus ponderosa and Pinus leiophylla may be occasional on microsites. Shrubs include a mix of oaks, manzanita, and others, but Quercus hypoleucoides is at least common.
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: No Data Available
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 tree canopy (>25% cover), codominated by the evergreen trees Pinus discolor and Juniperus deppeana, with occasional Pinus ponderosa or Pinus leiophylla present. The moderately dense to dense shrub layer (>25% cover) is dominated by the broad-leaved evergreen oaks Quercus hypoleucoides and Quercus rugosa, but includes many other shrub species such as Arctostaphylos pringlei, Arctostaphylos pungens, Garrya wrightii, Nolina microcarpa, Agave parryi, Rhus trilobata, and Quercus gambelii. The herbaceous layer is generally sparse and composed of mixed grass and forb species including Aristida schiedeana var. orcuttiana (= Aristida orcuttiana), Bouteloua curtipendula, Elymus arizonicus, Muhlenbergia emersleyi (low elevations), Geranium caespitosum, and Thalictrum fendleri. The presence of Quercus hypoleucoides in a moderately dense shrub layer is diagnostic of this Pinus discolor woodland type.
Dynamics: No Data Available
Environmental Description: Stands are small and patchy and limited to elevated plains, mountain and foothills slopes, and ridgetops. Elevation ranges from 1890-2130 m. Soils are shallow and rocky, often with rock outcrops.
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, and possibly in the Trans-Pecos region of Texas and Mexico.
Nations: MX?,US
States/Provinces: AZ, MXCHH?, NM
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.685748
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 | CEGL000771 Border Pinyon / Silverleaf Oak Woodland | CEGL000771 | 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 hypoleucoides (Stuever and Hayden 1997b)
= Pinus discolor / Quercus hypoleucoides Woodland (Bassett et al. 1987)
= Pinus discolor / Quercus hypoleucoides 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.
- 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.