The complexity of ovulate cones and their preservation as fossils makes them promising material for reconstructing the evolutionary history of gymnosperms, but phylogenetic analyses of cone morphological characters of Pinaceae have been inconclusive. We describe the ovulate cone anatomy of Pinus nelsonii, a rare and phylogenetically isolated pinyon pine endemic to Mexico, and add the species together with Pinus ponderosa and the fossil Pinus belgica to a recoded and expanded ovulate cone morphology matrix for fossil and extant Pinaceae. The cone anatomy of Pinus nelsonii conforms to previous generic concepts of Pinus. Despite its phylogenetically isolated position among the soft pines (Pinus subgenus Strobus) and thus potential for displaying plesiomorphic features, the cone of Pinus nelsonii is unlike the oldest Pinus fossil cones in possessing enlarged, functionally wingless seeds partially embedded in scale tissue, and in lacking sclerenchyma in the cortex of the axis, in the bract, and in the scale. Cladistic analysis of cone morphology characters recovers several Pityostrobus species in a clade with Pinus. Although the inferred relationships among living species do not coincide in several respects to molecular studies, adding taxa and further exploration of characters promise to clarify relationships.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 36 • No. 3