The genus Holltumara is a cross between Arachnis x Renanthera x Vanda and therefore considered of trigeneric origin. The Holltumara " Akihito" is named after the Japanese Emperor. In orchid hybridization, the trend is towards multigeneric hybridization . Successful genera for multigeneric hybridization includes Dendrobium, Vanda, Aranda, Phalaenopsis and Renantanda.
Ref: V.P.E. Phang ( 1983) A list of Orchid Hybrids of Singapore and Malaysia, 1960 -1980. Singapore University Press, Singapore.