Buddleja oblonga is a species endemic to the Serra do Caparaó and south as far as Paraná in Brazil, where it grows in fields and damp thickets near streams at altitudes of 1,000 - 2,200 m.[1] The species was first named and described by Bentham in 1846.[2]
Buddleja oblonga is a dioecious shrub with dark-brown longitudinally fissured bark. The young branches are quadrangular, bearing sessile oblong to elliptic membranaceous leaves 6 - 15 cm long by 0.8 - 3 cm wide, glabrous above and glabrescent below. The white inflorescences are 4 - 10 cm long, comprising 4 - 8 heads in the axils of the reduced terminal leaves, the heads 0.7 - 1.5 cm in diameter, with 5 - 9 flowers; the corollas 4.5 - 5.5 mm long.[1]