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Leaves unijugate, elsewhere sometimes unifoliolate and in G. conjugata leaflets occasionally fused; leaflets with a main nerve and sometimes several secondary lateral nerves from the base, often with pellucid gland dots; petiolule ± twisted (the distal margin of the leaflet arising higher and in a different plane); stipules small, falling very early.
Flowers spirally arranged on the inflorescence axis; bracts small, caducous or subpersistent; bracteoles 2, small, caducous or subpersistent, not enclosing the bud.
Stamens usually 10; filaments alternately long and short in the bud; anthers dorsifixed, dehiscing by longitudinal slits.
Pods suborbicular or obliquely elliptic, either coriaceous and tardily dehiscent, or chartaceous and indehiscent.
Ovary stipitate or sessile; ovules usually 2; style elongate, filiform; stigma terminal, capitate.
Seeds 1(2) without an areole, with a fleshy aril enveloping the seed, or without.
Calyx lobes 4, unequal (2 outer, 2 inner), imbricate.
Inflorescence paniculate, of groups of spikes.
Trees or shrubs, evergreen, unarmed.
Hypanthium absent.
Petals absent.
