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Chromosome NumberPollen GrainsFloraEmbryo Sac DevelopmentTropical AfricaPollen MorphologyMonotypic GenusChromosomeVascular PlantsGenus SonchusChromosome CountsChromosome MorphologyMire VegetationMorphological CharactersPollination EcologySouthern AfricaMature EmbryoNOTESLichen GenusScanning Electron Microscopy