Strophanthus perakensis Isotype: Scortechini 1818 (CAL) Lectotype: Scortechini 1818 (K) Scortechini 1818 (NY) Scortechini 1818 Squires 901 (M) Squires 901 (BM) Squires 901 (MO) Isotype: Squires 901 (A) Squires 901 (K) Holotype: Squires 901 (A) Squires 901 (NY) Isotype: , Vietnam, Gialai-Kontum, Dakley (Dakmon), Tran Dinh Lý 357 (HN) Holotype: , Vietnam, Gialai-Kontum, Dakley (Dakmon), Tran Dinh Lý 357 (HN) Isotype: Thailand, Chon Buri, Sri Racha, Naung Nam Kio., Kerr 4173 (BM) Thailand, Chon Buri, Sri Racha, Naung Nam Kio., Kerr 4173 Lectotype: Thailand, Chon Buri, Sri Racha, Naung Nam Kio., Kerr 4173 (K) Thailand, Chon Buri, Sri Racha, Naung Nam Kio., Kerr 4173 (BR)