XVI International Botanical Congess

The proposed phylogenetic analysis focuses on the Olacaceae, and six species of others Santalales orders. The Santalales are monophyletic and the Olacaceae polyphyletic, but the clades and the grades obtained are related to the main existing tribes and palynologic or anatomic groups, except for Chaunochiton and Ptychopetalum. A clade fits to most of the Olacoideae and a grade to the Anacolosoideae. Opilia and a clade including Schoepfioideae, Santalaceae and Loranthaceae fit between them. The parasitism is an apomorphic feature appearing occasionally in Anacolosoideae and permanently in Olacoideae, Schoepfioideae and other Santalales. The variations of the main features are discussed.