Neurocalyx calycinus is a shrub native to India and Sri Lanka. It is found in evergreen forests and wet, tropical habitats.
It is a large herb, with leaves growing to . Its racemes are long, with white flowers. It has different classifications.
It is a wild ornamental plant classified under the tribe Ophiorrhizeae. It can grow up to and is dispersed on rocky crevices near streams in tropical wet evergreen forests at altitudes higher than .