POLLEN MORPHOLOGY OF EUPHORBIA SUBGENUS AGALOMA SECTION TITHYMALOPSISAND RELATED SPECIES (EUPHORBIACEAE)

The pollen morphology of seven species of Euphorbia, subg. Agaloma sec t. Tithymalopsis (Euphorbiaceae), and ten more species added by a late r worker, has been examined with light and scanning electron microscop y. Three poorly differentiated exine sculpturing patterns have been ob served within the 17 species. Species of sect. Tithmalopsis do not hav e pollen that could be distinguished from pollen of the 10 related spe cies of subg. Agaloma. The present results do not support the monophyl y of sect. Tithymalopsis proposed by morphological and isozymic data.