Commelinaceae and Pontederiaceae (Commelinales) pollen from river plateau wetlands (Argentina)
Abstract
Pollen grains of Commelinaceae and Pontederiaceae (Commelinales) from the Río de La Plata wetlands (Argentina). The characters of pollen grains of the Commelinaceae and Pontederiaceae growing in the Río de la Plata wetlands were studied. Analyses were performed with light and scanning electron microscope. An update of some previously known data was made, and pollen of Pontederia rotundifolia and Tradescantia cerinthoides is described here for the first time. Both families have heteropolar pollen grains with bilateral symmetry. Commelinaceae bear monosulcate, and echinate sporoderm, while disulcate, smooth, verrucose or fossulate sporoderm, were found in Pontederiaceae. Fossulate type of exine is new to the family. Membrane of the sulci is usually present, with absent or barely present exine, represented by a thin layer of nexine. Ornamentation varies in different taxonomic levels: allows distinction among of tribes and genera of the studied Commelinaceae, and is a species trait in the Pontederiaceae from the area.
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