Key: Step 1. KEY TO THE GENERA

1a. Petals absent (though inner sepal may be petal-like, then single); fruits covered with glochidiate (long stinging) hairs; hairs simple    

Chaetocarpus Thwaites, 1854

1b. Petals 5; fruits tomentose with normal hairs; hairs simple and stellately bundled    

Trigonopleura Hook.f., 1887