Renantanda

× Renantanda, abbreviated Rntda. in the horticultural trade, is the nothogenus for intergeneric hybrids between the orchid genera "Renanthera" and "Vanda" (Ren. x V.). Its parent plants are both endangered, and have separate breeding seasons, so this hybrid is incredibly rare. Because of that, it is highly marketable.
References.
http://www.rhs.org.uk/publications/orchidreview/orchid1105/renantanda.asp
A List of Orchid Hybrids of Singapore and Malaysia, 1960-1980 By V. P. E. Phang