Colloquium: The Utility of Pollen in Systematic and Morphological Studies: A Celebration of the Life of John J. Skvarla
Robinson, Harold .
Does pollen help in the taxonomy of the Vernonieae? Some examples.
Use of pollen in the Vernonieae is traced from the distinction between lophate and non-lophate forms by Steetz (1864) through the discovery of many patterns of lophate pollen by Stix (1960). Variations in extent of perforated tectum, additional lophate patterns, and columellar structures including rhizomate forms are reviewed. More recently discovered variations in non-lophate forms are noted. The distribution of some of the forms in the tribe is reviewed. Many of the specialized forms of pollen are very reliable indicators of phylogeny, while most of the Type A (sublophate pollen grains seem to arise multiple times as a sort of reversion. The latter can become characteristic of groups such as Vernonia Schreb. the Piptocarphinae and most Gymnantheminae, but are unreliable phyletically until proven otherwise.
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1 - Smithsonian Institution, Department of Botany MRC 166, National Museum Of Natural History, Po Box 37012, Washington, DC, 20560-0166, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Fort Camp Lounge/Gage
Date: Tuesday, July 29th, 2008
Time: 3:00 PM