Abstract:In order to discuss the inter-and sub-generic classification of Callerya Endl. and Millettia Wight et Arn. (Leguminosa) from China, the pollen morphology of 11 species, 5 varieties of Callerya and 6 species, 2 varieties of Millettia were observed under scanning electron microscopy. The results showed that pollen grains of Callerya and Millettia were monads, tricolporate or tricolpate, radiosymmetric, mainly spheroidal and suboblate in equatorial view, circular or rounded triangular in polar view. The pollen of Callerya was medium in size, whereas those of Millettia were small. The colpus membrane of both genera pollen was more or less raised or sunken, with finely or coarsely granular. There were six exine ornamentation types in pollen of Callerya & Millettia. Therefore, based on pollen morphology, Schot's hypothesis was not supported which combine all Callerya cinerea-complex species except for C. nitida and C. cochinchinensis into C. cinerea, and it was congruent with recent phylogenetic studies which separating Callerya from Millettia s. l. from pollen sizes.
