Observation on the Pollen Morphology in 9 Species of Lepidium(Brassicaceae) in China by SEM

The pollen morphology of 9 species of Lepidium(Brassicaceae)in China were observed and studied under the scanning electron microscope(SEM).It is indicated that pollen grains are perprolate or prolate,with tricolpate,reticulate sculpture;the exine sculpture may be divided into three types: the lumina irregular,the brink of the lumina not smooth,verrucate;the lumina circular or subcircular,the brink of the lumina smooth;the lumina polygonous or irregular polygonous,the brink of the lumina smooth,rarely verrucate.