Tree, c. 20 m high, dbh up to 20 cm; Branchlets sericeous when young; Leaves 1- or 2-jugate; Inflorescences axillary, branching along the flattened, subsericeous, 3-10 cm long axis; Flowers c. 3.5 mm in diam. Sepals 5, ovate, margin pilose, with glands, outside and inside glabrous; Petals 5, elliptic, 3-3.2 by 1.2-1.3 mm, white; Stamens 8; Fruits unknown.
Asia-Tropical, Papua New Guinea present, W New Britain Prov present
Malesia: Papua New Guinea (W New Britain Prov.).
Guioa novobritannica belongs to the G. rigidiuscula-complex. Typical for this species are the small, falcate, papillate leaflets with a single large sac.