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Cotyledons 2, unfolding spirally and arising above soil level (known only in M. tetrandrus).
Calyx-tube shallowly campanulate, slightly oblique.
Stamens 4, 1-seriate, antipetalous, not exserted.
Inflorescences of terminal and axillary panicles.
Petals 4, inserted near the margin of the disk.
Disk with pubescent scarcely free margin.
Leaves opposite, petiolate, lepidote.
Shrubs or more rarely small trees.
Flowers small, 4-merous, sessile.
Style scarcely exserted.
Fruit 4-winged.
Ovules 2.