Artabotrys (Annonacea) in East Malesia

Abstract

Studies on the taxonomy of the genus Artabotrys R. Br. ( Annonaeceae ) in East Malesia were based on morphological characters by examining a large number of Herbarium Bogoriense (BO), Celebense (CEB), Manokwari (MAN), Departemen of Forest Lae (LAE) and living plants of Bogor Botanical Garden. There are eight species which have been known previously: A. camptopetala Diels, A. gracilis King., A. hexapetalus (L.f.) Bhandari, A. inodorus Zipp., A. macranthus Holthuis, A. speciosus Kurz., A. suaveolens Blume, A. sumatranus Miq. and A. venustus King. Four new species are proposed in this treatment : A. desmidantha Diels ex Triasti., A. longipetalus Triasti., A. palmatiflorus Triasti., and A. trichofolius Triasti.. An identification key and detailed discription are provided for taxa. Artabotrys suaveolens Blume is widely distributed. While A. camptopetala, A. desmidantha, A. longipetalus, A. inodorus, A. palmatiflorus and A. trichofolius have a limited distribution. New Guinea is the area with the highest diversity of Artabotrys species in East Malesia. A phylogenetic analysis with Cyathocalyx sumatranus as outgroup, shows three major groups. The first group is Cyatocalyx sumatranus. The second group is A. macranthus which has the closest relationship with the outgroup. The third group separated from the other group by the synapomorph characters 2 (leaf length), 3 (hook), 11 (carpel shape), 14 (number of ovule) and 15 (position of seed).