All Acanthomintha have four stamens, with the upper two reduced, whether they are sterile or not. Thornmint styles are slender and their fruit is ovoid in shape with smooth exterior texture.
All Acanthomintha share the characteristic of having four stamens, with the upper two being reduced, irrespective of whether they are fertile or not. Thornmint's styles are thin, and its fruit is egg-shaped with a smooth surface.