Taxonomic treatment on Garcinia sopsopia (Section Brindonia, Clusiaceae) in Thailand, with a new synonym and three lectotypifications of its synonyms

<i>Garciniasopsopia</i> belongs to the section Brindonia in the family Clusiaceae. The fruits, young shoots and leaves are edible and have a sour taste. Morphological description and illustrations are provided, along with notes on distribution, habitats and ecology, phenology, a preliminary conservation assessment, etymology, vernacular names, uses and specimens examined. <i>Garciniamckeaniana</i> is a newly-synonymised name under <i>G.sopsopia</i>. Three synonyms of <i>G.sopsopia</i> are here lectotypified, including <i>G.paniculata</i>, <i>G.rhumicowa</i> and <i>G.mckeaniana</i>.