XVI International Botanical Congess

The diporate bilaterally symmetrical pollen grains have been found in one species of Amphirrhox from 16 investigated species of the family Violaceae. The pollen of the other species of this genus is common to pollen of this family: 3-colporate. Diaperturate type of pollen occurs very rarely in the dicotyledonous taxa. The same diporate pollen is known for the some spcies of the next genera: Piptocalyn, Trimenia (Trimeniaceae), Tropoelum (Tropaeolaceae), Alyxia (Apocynaceae), Cytinus, Mitrastemon (Rafflesiaceae), Itea (Saxifragaceae), Adenanthos, Banksia (Proteaceae). These members belong to widely unrelated taxa of antiosperms. Diaperturate pollen species was found in the families in which the majority of species have 3-4-pan-porate (Proteaceae), 3-colp(or)ate (Saxifragaceae), sulculate (Calycanthaceae) pollen. In the family Tropaeolaceae five studied species have diporate pollen type, two ones 2-3-porate and three ones 3-panporate. Diaperturate type more often occurs in monocotyledonous and primitive dicotyledonous plants, but sometimes occasionally it has been discovered in advanced dicotyledonous orders up to Urticales and Scrophulariales. This species of the genus Amphirrohox is unique by its palynological features in all the order Violales, but it is not argument for its taxonomical isolation.