The male flowers of "N. andamana" have red tepals and the androphore reaches only 1 mm in length, whereas those of "N. suratensis" have green tepals with red margins and a longer androphore of up to 3 mm.
The male flowers of "N. andamana" have red tepals and the androphore reaches only 1 mm in length, whereas those of "N. suratensis" have green tepals with red margins and a longer androphore of up to 3 mm.