It grows in scrub, woodland, and sandy clearings, often on limestone substrates.

It is an erect shrub which may reach 1.5 meters in height, with many leafy flowering stems.

The thin leaves are oval with wide triangular tips and serrated edges.

The oppositely arranged pairs fuse about the stem at the bases, sometimes forming a disc.

The inflorescence bears glandular, wide-mouthed tubular flowers up to 2 centimeters long in shades of pink or purple.