“…Euryoma longifolia Jack, Eurycoma apiculata Benn, and Eurycoma harmandiana Pierre (Nooteboom, 1962;Clayton, 2008). Eurycoma harmandiana is only found in the border region of Thailand and Laos (Kanchanapoom, 2001), Eurycoma longifolia is distributed widely in tropical South-East Asia including Myanmar, Thailand, Peninsular Malaysia, Sumatra, Borneo and Philipines (Nooteboom, 1962;Padua et al, 1999;Mohamed et al, 2015;Rehmen et al, 2016;Nguyen et al, 2017;Abubakar et al, 2017. ), and Eurycoma apiculata is confined to Peninsular Malaysia and Sumatra (Nooteboom, 1962;Padua et al, 1999).…”