THE OBSERVATION ON THE POLLEN MORPHOLOGY OF GYNOSTEMMA

The present paper for the first time describes the SEMmorphologic features of the pollen of the samples from 10 demes (including 7species in2subgenera). The pollen of the samples is small pollen type, elliptic, long-spheric or subspheric,3-colporate,isopolar.Its strip-like exine ornamentations occasionally dichotomize,and are all longitudinally arranged. The strip-like exine ornamentaton and the irregularly thin-horizontal grain on the strip-like sculptures are the common features of the pollen morphology. The size and shape, especially the feature of the polar face, are to varying degrees different between the species.There is no distinctive difference between the two subgenera.