Trees to 40 m tall. Petiole short; leaf blade venation arcuately looped near margin, secondary veins 4-24 on each side of midvein. Flowers terminal, leaf opposed, or extra-axillary, solitary or in cymes; sympodial rachides simple or branched, internodes short or long. Flowers bisexual, pendent. Pedicel short or long, with basal bracts and submedian bracteoles. Sepals 3, valvate, basally ± connate. Petals 6, in 2 whorls, free, with each whorl valvate; outer petals usually smaller than inner petals, without a basal claw; inner petals with base clawed, apically connivent to form a mitriform dome. Stamens many; anthers cuneate, extrorse; connectives apically truncate. Carpels few to many, free; ovules several per carpel, in 2 series. Fruit apocarpous; monocarps sessile or stipitate, globose, obovoid, or cylindric, sometimes longitudinally ridged, smooth or rarely warty.