ibclogo XVI International Botanical Congess


Abstract Number: 6017
Session = 3.4.6


POLLEN MORPHOLOGY AND DETAILED STRUCTURE IN THE BIGNONIACEAE


A. Spencer Tomb, Division of Biology, Kansas State University, Manhattan, KS


Bignoniaceae are a taxonomically difficult, eurypalynous family. Pollen of the family is an example of of Van Campo's successiformy trend. Based on 320 samples selected and identified by Alwyn H. Gentry, several tribal examples of this trend will be presented. All samples were studied by SEM and LM, and 20 taxa were sectioned and examined by TEM. Tricolporate pollen with 1-2 irregular, rift-like endoapertures in each colpus and fine reticulate to foveolate exine surfaces is the most frequent and perhaps the ancestral pollen type. The multiple endoapertures are much more irregular than those of the Leucophylleae (Scrophulariaceae) and Myoporaceae. Significant pollen variation was found in species of Amphitecna, Anemopegma, Cydista, Memora, Schlegelia, and Tanaecium. Pollen of Cuspidaria, Catalpa, and Chilopsis are shed as tetrads or polyads.


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