This member of the Rubiaceae family was given this name by Matthew H.P. Jebb and Camilla Rose Huxley in 2019. It is found on Mount Bwebwesu and Rossel Island; Papua New Guinea, growing as an epiphyte on rocks with quite some water and some to lots of sun. The caudex can grow to fifteen centimetres in diameter, the entire plant to 60 centimetres in height. The flowers are white while the fruits are red. The genera name after Greek hydnon meaning 'tuber' and phyton meaning 'plant', after the swollen branches. The species is named the d’Entrecasteaux islands from where the species was first recognised.

