Abstract
SUMMARYCytogenetics and embryology of Setaria cordobensis Herrmann and S. leiantha Hackel were investigated in four populations collected from different environments in Argentina. A somatic chromosome number of 2n = 36 was confirmed for S. leiantha and reported for the first time for S. cordobensis. Bivalent pairing was regular in pollen mother cell meiosis, but abnormalities such as dyads, triads and tetrads with micronuclei or non-conventional arrangement were described with different frequencies. A high degree of similarity between the two species was found investigating megasporangium, megasporogenesis and megagametogenesis. There were major differences in ovule length and width at anthesis. Both species follow a typical Polygonum development and no indicator of apomictic processes was noted.
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