Evolution and Diversification in the Sapindales
Daly, Douglas C. .
The Tribe Protieae (Burseraceae) Re-visited.
Subfamilial classification of the Burseraceae is in a fascinating state of flux. As molecular systematic investigations progress and the results are reconciled with morphology, Bursera moves toward absorbing Commiphora, the Mexican endemic Beiselia is indicated as a monotypic tribe, and the integrity of the Boswelliinae is being confirmed but sister to traditional tribe Canarieae instead of Bursereae, which may be absorbed by the former. Meanwhile, with the removal of Trattinnickia and later Garuga, the Protieae have remained intact as a tribe but internally chaotic. The tribe is morphologically conservative, and habitat shifts have not been accompanied by major changes in flower or fruit morphology. Since the unification of Malagasy Marignia and Neotropical Icica under Asian Protium by Marchand in 1867-1868, the latter has consisted of ca. 175 species in the Neotropics plus one species each with non-overlapping distributions in Mauritius, South Asia, Malesia, the Philippines, New Guinea, tropical China (unconfirmed), and Madagascar (possibly two species). The remainder of the tribe comprises two small genera, Crepidospermum and Tetragastris. Neither molecular systematic studies nor data gathered from leaf architecture and pollen, flower, and seed morphology have satisfactorily separated these two genera from a broadly circumscribed Protium, nor have they elucidated the subgeneric divisions of the latter, although several sections of Protium are clearly natural groups based on multiple sets of morphological and molecular data. The tribe may end up as one rather large genus or more than a dozen, but internal resolution of the tribe’s phylogeny now hinges on obtaining samples for molecular studies of several far-flung taxa possibly representing distinct lineages; this highlights both the need for both greatly increased field work and facilitation of access to silica-dried material from countries that are either resistant to export of such material or politically unstable.
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1 - New York Botanical Garden, Institute of Systematic Botany, 200 St. & Kazimiroff Blvd., Bronx, NY, 10458-5126, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Boulevard B/Hilton
Date: Tuesday, July 10th, 2007
Time: 10:15 AM