Genkei Masamune (正宗 厳 敬 Masamune Genkei, 1899-1993) was 'n Japannese plantkundige, wat eers in Formosa, en na die Tweede Wêreldoorlog in Taiwan gewerk het. Hy is bekend vir sy omvattende botaniese indekse van Borneo en Taiwan, sowel as vir die identifisering van groot getalle nuwe spesies. Die standaardskrywersafkorting Masam word gebruik om hierdie persoon as die skrywer aan te dui wanneer 'n botaniese naam aangehaal word. (1954) Flora Kainantensis: A List of Vascular Plants of Taiwan Plant Taxonomic Laboratory, Faculty of Sciences, Taipei National University, Taipei, Taiwan; (1945) Boruneo no shokubutsu hoi. Enumeratio pteridophytarum Bornearum Taihoku Imperial University, Taihoku, Formosa; (1942) Boruneo no kenka shokubutsu. Enumeratio phanerogamarum Bornearum Taihoku Imperial University, Taihoku, Formosa; (1936) met Noriaki Fukuyama Short flora of Formosa; or, An enumeration of higher cryptogamic and phanerogamic plants hitherto known from the island of Formosa and its adjacent islands "Kudoa", Taihoku, Formosa; (1933) Phytogeographical position of Japan concerning indigenous genera of vascular cryptogamic plants Taihoku Imperial University, Taihoku, Formosa;