A checklist of Euphorbiaceae in Bhutan with a new record of the genus Sumbaviopsis

The Euphorbiaceae, known for their significant diversity, are particularly abundant in tropical regions and have undergone several taxonomic reclassifications. Bhutan’s lowland tropical forests remain the least explored in this family, creating a gap in the floral database. The genus Sumbaviopsis J. J. Sm., unrecorded in Bhutan, was encountered during a field visit. We report Sumbaviopsis albicans (Blume) J. J. Sm. as a new species record for Bhutan. Following recent taxonomic revisions and current newfound species, Bhutan now lists 41 species and 17 genera within Euphorbiaceae. This newly found species contributes to the country’s floristic database, enhancing the understanding of the biodiversity of the country.