Fruit a pendulous elongate tetragonal woody septifragal capsule, dehiscing from the apex or from the apex and base simultaneously; columella extending to the apex of the capsule, 4-ridged, softly woody, each face slightly indented with the imprints of 1–2 seeds.
Staminal tube shortly cylindric or cup-shaped, margin entire or with very short broad teeth or with paired deltate-acuminate appendages alternating with the anthers; anthers 8.
Seeds 2 (4) per loculus, but only 1–2 fertile, attached to the apex of the columella by the winged end of the seed and leaving inconspicuous scars on falling.
Ovary 4-locular, each loculus with 2 rows of 2 ovules; style short; style-head capitate, obscurely 4-lobed.
Disk short, broad, cushion-shaped, enveloping the base of the ovary, but free from the staminal tube.
Calyx lobed almost to the base; lobes 2+2, imbricate, the outer larger than the inner.
Petals 4, free, much longer than the calyx in bud, imbricate.
Flowers monoecious, borne in large panicles.
Leaves paripinnate; leaflets entire.
Large trees.