It is notable for being owned by Madame Nguyen Cao Ky (born Đặng Thị Tuyết Mai), the ex-wife of General Nguyen Cao Ky who served as Prime Minister and Vice President of the former South Vietnam.
The specimen later used as the type specimen was collected on February 3, 1929 at Khao Pho Ta Luang Kaeo near Ranong.