Oberonia flavescens is an epiphytic or lithophytic herb that forms large clumps.

The sepals and petals are egg-shaped, about 1.2 mm (0.047 in) long and turned back towards the ovary.

[2][3][4] Oberonia flavescens was first formally described in 2006 by David Jones and Mark Clements who published the description in Australian Orchid Research.

The type specimen was grown in the Australian National Botanic Gardens from a plant collected in the McIlwraith Range.

[6]: 308 The northern green fairy orchid usually grows on trees and rocks in rainforest, sometimes in other humid, sheltered places such as mangroves.