Taxonomic Revision of the Pinus Mugo Complex and P. Rhaetica (P. Mugo Sylvestris) (Pinaceae). Christensen, K. Nordic Journal of Botany, 7(4):383–408, September, 1987.
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The Pinus mugo complex is revised, and a new infraspecific classification of the species is proposed. The species is divided into two subspecies and an intermediate nothossp., viz. ssp. mugo, ssp. uncinata and nothossp. rotundata. P. mugo ssp. mugo is divided into f. mugo and f. applanata comb, et stat. nov. (P. pumilio) and P. mugo nothossp. rotundata into f. rotundata and f, mughioides comb. nov. The putative hybrid P. mugo \texttimes sylvestris found in mixed stands of the parents is named P. \texttimes rhaetica. A description of P. sylvestris and a key to P. mugo, P. sylvestris and P. \texttimes rhaetica is given.
@article{christensenTaxonomicRevisionPinus1987,
  title = {Taxonomic Revision of the {{Pinus}} Mugo Complex and {{P}}. Rhaetica ({{P}}. Mugo Sylvestris) ({{Pinaceae}})},
  author = {Christensen, Knud},
  year = {1987},
  month = sep,
  volume = {7},
  pages = {383--408},
  issn = {0107-055X},
  doi = {10.1111/j.1756-1051.1987.tb00958.x},
  abstract = {The Pinus mugo complex is revised, and a new infraspecific classification of the species is proposed. The species is divided into two subspecies and an intermediate nothossp., viz. ssp. mugo, ssp. uncinata and nothossp. rotundata. P. mugo ssp. mugo is divided into f. mugo and f. applanata comb, et stat. nov. (P. pumilio) and P. mugo nothossp. rotundata into f. rotundata and f, mughioides comb. nov. The putative hybrid P. mugo \texttimes{} sylvestris found in mixed stands of the parents is named P. \texttimes{} rhaetica. A description of P. sylvestris and a key to P. mugo, P. sylvestris and P. \texttimes{} rhaetica is given.},
  journal = {Nordic Journal of Botany},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-10060611,forest-resources,pinus-mugo,taxonomy},
  lccn = {INRMM-MiD:c-10060611},
  number = {4}
}
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