TY -JOUR AU -Anissara Damthongdee AU -Pimjan Narintarangkul Na Ayutthaya AU -Kithisak Chanthamrong AU -Setthikij Ruangritthidech AU -Chattida Wiya AU -Tanawat Chaowasku TI -Goniothalamus obovatus (Annonaceae), a new species from southern Thailand PY -2025 DA -2025-09-04 JO -Taiwania VL -70 IS -4 SP -631 EP -634 UR -https://taiwania.ntu.edu.tw/abstract/2119 AB -Goniothalamus obovatus Chaowasku & Damth., a new species of Annonaceae from southern Thailand is described and illustrated. It is morphologically most similar to G. banii endemic to Vietnam, but can be distinguished from it by possessing terete (vs ± angular) branches, a subcordate to cordate (vs rounded) leaf base, shorter inner petals, an inner petal apex that is ± acute (vs long-acuminate), a lower ratio of inner petal to outer petal length, fewer stamens per flower, a staminal connective apex that is ± apiculate (vs rounded), fewer carpels per flower and densely hairy (vs glabrous) ovaries. The conservation status of the new species is provisionally assessed as Data Deficient. DO -10.6165/tai.2025.70.631