Pinus douglasiana
Type: Nayarit, Cerro Juanacata, July 1940, M. Martínez 3429 (holotype, MEXU) (Farjon and Styles 1997).
Mexico: Mainly Jalisco, Michoacán, México & N Morelos, but extending N into Nayarit and the Sierra Medre Occidental crest between Sinaloa and Durango, and extending S locally into Guerrero & Oaxaca. Found at (1100-)1400-2500(-2700) m elevation in mixed pine and pine-oak forests. At the highest and wettest sites it is associated with Abies sp., Picea sp. (in Durango) or Cupressus lusitanica. More commonly, it is found with Pinus pseudostrobus, P. herrerae, P. leiophylla, P. lawsonii, P. ayacahuite in the S part of its range, P. oocarpa at low elevations, and P. devoniana in drier sites (Farjon and Styles 1997). See also Thompson et al. (1999).
An important timber tree within its range, typically logged with its congeners in mixed stands (Farjon and Styles 1997).
P. douglasiana is parasitized by the mistletoe Cladocolea cupulata Kuijt (Loranthaceae) (Kenaley and Mathiasen 2006), and by the dwarf mistletoe Arceuthobium globosum subsp. grandicaule (Hawksworth and Wiens 1996).