Ser. Amoenae Prain; ser. Plicatae Prain; ser. Pygmaea Prain.

Herbs annual or perennial, low or tall, sometimes woody. Leaves in whorls of 3 or 4, some opposite proximally, elliptic to lanceolate, pinnatisect or rarely pinnatifid. Inflorescences spicate to racemose. Calyx lobes 5 or sometimes by fusion appearing 3. Corolla usually purple, red, or white, rarely yellow; tube decurved basally; galea toothless, beakless.