Tree, 5-25 m high, dbh 5-30 cm; Branchlets shortly sericeous when young; Leaves 2- or 3-jugate; Inflorescences ramiflorous (to axillary), unbranched to branching basally and along the flattened to terete, (sub)sericeous, 0.1-12.1 cm long axis; Flowers unknown. Sepals 5, ovate, margin pilose, outside and inside glabrous, light green; Petals unknown. Stamens unknown. Fruits with 1-3 well developed lobes, 1 2-1.6 by 2-2.7 cm, smooth to slightly rugose or ribbed, glabrous, red when fresh, black when dry; Seeds obovoid, c, 7.5 by 5.5 mm;
Asia-Tropical, Morobe present, Northern Prov present, Papua New Guinea present
Malesia: Papua New Guinea (Morobe, Northern Prov.).
Guioa grandifoliola is part of the G. ri-g'diuscula-complex and is characterized by its enormous, ovate leaflets without indumentum and domatia. The fruits are like those of G. rigidiuscu-la, only smaller.