Nilgonda is a herb found in Western Ghats. The species name trinervius comes from the fact that the leaves of the plant have 3 nerves. Flowers occur in a spiny spike, 3-15 cm long, occuring in leaf axils. The bracts are 8 mm long. Blue flowers are 2 lipped, with yellow centre, and veined with white or pale blue. Upper lip has dark violet, fading outwards from centre. Flowering: December.