Guwahati: In a discovery that reshapes India’s botanical geography, scientists have recorded a rare tropical tree species, Goniocheton arborescensn on the Indian mainland for the very first time. Until now, the species was known in India only from the Andaman and Nicobar Islands.
The finding, made at Pasighat in Arunachal Pradesh, marks a major northward extension of the species’ known range and highlights the Northeast as a critical but still underexplored biodiversity frontier.
The discovery was made by botanists Karnan Jeyaprakash and Kaliamoorthy Ravikumar during field surveys at the North Eastern Institute of Ayurveda & Folk Medicine Research (NEIAFMR) campus. Careful comparison with historical herbarium records—including specimens housed at the Royal Botanic Gardens, Kew confirmed that the tree had never before been documented on mainland India.
Globally, Goniocheton arborescens occurs across Southeast Asia and parts of the Pacific, but its Indian presence was thought to be limited to island ecosystems. Its appearance in Arunachal Pradesh not only bridges a major biogeographical gap but also raises new questions about plant migration, historical forest connections, and climate-linked range shifts in the region.
The tree—belonging to the mahogany family (Meliaceae) can grow up to 20 metres tall and is known for its striking, bright pinkish-red fruits with orange arils. Flowering occurs in early spring, followed by fruiting during the monsoon months, making it an important seasonal resource for forest fauna.
Although Goniocheton arborescens is currently classified as “Least Concern” on the IUCN Red List, researchers observed only three individual trees at the mainland site. Scientists caution that such sparse populations warrant closer ecological monitoring and conservation attention, especially in biodiversity hotspots facing increasing land-use pressure.
Botanists say the finding underscores how much remains unknown about India’s plant diversity, particularly in the Northeast, and strengthens the case for intensified field exploration and habitat protection.
“This record not only adds a new species to the flora of mainland India but also reinforces Arunachal Pradesh’s status as a living archive of ancient plant lineages,” the authors note.
As scientists continue to uncover hidden botanical links between India, Southeast Asia, and the Pacific, discoveries like this serve as a reminder: India’s forests may still be holding many untold stories—rooted deep in their soil.