An assessment of orchids’ diversity in Penang Hill, Penang, Malaysia after 115 years - Rusea Go; Khor Hong Eng; Muskhazli Mustafa; Janna Ong Abdullah; Ahmad Ainuddin Naruddin; Nam Sook Lee; Chang Shook Lee; Sang Mi Eum; Kwang-Woo Park; Kyung Choi (Biodiversity and Conservation, 2011)