1	"Stamens 3 or 4; style 3-fid; spikelets 6–10 mm long; ultimate branches strongly to slightly curled; spikelets 6–10 mm long; leaf-sheaths not wrinkled"	"Caustis flexuosa"
1	"Stamens 5; style 4–5-fid; spikelets 10–15 mm long; ultimate branches straight, erect or spreading; mature leaf-sheaths wrinkled near apex"	"Caustis pentandra"