Thammarong, W., Maknoi, C. and Panyadee, P. 2019. Heterostemma succosum (Apocynaceae), a new record for Laos. Thai Forest Bulletin (Botany). 47, 2 (Oct. 2019), 187–189. DOI:https://doi.org/10.20531/tfb.2019.47.2.09.