Molecular phylogenetic and morphological support for the recognition of Friesodielsia lalisae (Annonaceae), a new species from S Thailand

Thirteen species of Friesodielsia Steenis (Annonaceae) and 11 representatives related genera were included in molecular phylogenetic analyses using up to six plastid DNA regions (psbA-trnH, trnL-trnF intergenic spacers; trnL intron; matK, ndhF, rbcL exons). The results support the recognition a new species, F. lalisae Damth., Baka & Chaowasku from Narathiwat, S Thailand, as belonging one two major clades Friesodielsia. members this clade show outer petals that separate at anthesis have concave basal portion, while other exhibit early during developmental stages flat base. is described illustrated. It most morphologically similar argentea (J. Sinclair) glauca (Hook. f. Thomson) but differs by having dissimilar sepal shape, higher proportion inner petal length longer petals. additionally former different leaf base latter denser indumentum on young twigs shorter flowering pedicels. province which endemic, seems be underexplored areas Thailand evidenced number based recent material. conservation status provisionally assessed Critically Endangered. Citation: Damthongdee A., Khunarak N., Kaeokula S., Saengpho C., Wiya Ue-aree P., Aongyong K. T. 2023: Molecular morphological for Thailand. – Willdenowia 53: 45–55. Version record first published online 10 April 2023 ahead inclusion issue.