Impatiens pathakiana (Balsaminaceae), a new species from Arunachal Pradesh, north-eastern India

Impatiens pathakiana Gogoi & Borah, a new species is described and illustrated from Arunachal Pradesh, north-eastern India. The species is restricted to hilly slopes along margin of subtropical evergreen broad-leaved montane forests of Chaglagam (Dalai Valley), Anjaw district of Arunachal Pradesh, India. Diagnostic morphological characters distinguishing the new species from the morphologically similar species, I. fenghwaiana Y.L.Chen and I. wuyuanensis Y.L.Chen are discussed.