Ophiorrhiza pemae is a species of flowering plant in the family Rubiaceae, formally described as new to science in 2026. Like its close relative O. shidiensis, it was discovered during botanical surveys in the Vijoynagar area of Changlang district, Arunachal Pradesh. The species name honours Pema Khandu, the Chief Minister of Arunachal Pradesh, recognising his administration’s support for documenting the state’s biodiversity.^[1] 

Description and features

Ophiorrhiza pemae is an erect perennial herb that grows taller than many of its relatives, with notably larger leaves featuring distinctive margins. Its flowers range from light pink to purplish tones, distinguishing them from the rose-pink gradient seen in O. shidiensis. Researchers established its identity by comparing these physical traits — leaf shape, flower structure, and inflorescence arrangement — against known members of the genus *Ophiorrhiza*.^[2] 

The species is most closely related to Ophiorrhiza himadrica, but differs clearly in three key ways: greater overall height, larger leaves with unique edge patterns, and its distinctively coloured blooms. These differences ruled out the possibility that the plants were simply variations of an existing species.^[3] 

Naming a new species after a living politician is always a calculated move. In this case, researchers chose to honour the state’s head of government rather than a local place-name, signalling institutional recognition of their work.

Habitat and discovery

Currently known only from the Indo-Burma biodiversity hotspot in northeastern India, O. pemae highlights how poorly documented the region’s flora remains despite decades of scientific interest. The Vijoynagar valley sits near Myanmar’s border, in terrain difficult enough that even metre-tall herbs can remain unknown to Western science until recently.^[4] 

Related species

Ophiorrhiza pemae was published together with another new species, Ophiorrhiza shidiensis, which takes its name from "Shidi," the traditional word used by the Lisu (Yobin) community for Gandhigram. While both belong to the same genus and were found in the same district, they differ clearly in growth height, leaf margins, and flower colouration.^[5] 

The genus *Ophiorrhiza* belongs to Rubiaceae, the large family that also includes coffee and madder. With hundreds of genera and thousands of species worldwide, the family regularly yields new discoveries in tropical and subtropical Asia.^[6]