Key for Curtia Cham. & Schltdl.

1Low shrub; leaves suborbicular, 0.8-1.2 cm wide, 3-veined; inflorescence a dense panicle, 1-3 cm long
1'Slender herb; leaves linear to narrowly elliptic, 0.03-0.3 cm wide, venation hardly visible; inflorescence a loose repeatedly branched dichasium, up to 10 cm long
2Flowers homostylous, corolla tube cylindrical often slightly narrowed in upper part, anthers connective not prolonged above thecae
2'Flowers heterostylous, corolla tube infundibuliform, anthers connective prolonged above thecae