KEY TO THE GENERA OF SESUVIOIDEAE

1. Leaves alternate; fruit a winged nut or a compound, spiny trample burr................................................. Tribulocarpus

1. Leaves opposite; fruit a circumscissile capsule............................................................................... 2

2. Ovary with 1 locule, 1 style................................................................................... Trianthema

2. Ovary with 2–5 locules, 2–5 styles..................................................................................... 3

3. Operculum splits into 2 halves upon opening; 4 ovules............................................................. Zaleya

3. Operculum remains intact upon opening; more than 4 ovules...................................................... Sesuoium