HABIT	PERENNIAL HERBS OR UNDERSHRUBS.
STEMS	ANGULAR, RIBBED, THICKENED ABOVE THE NODE, MORE OR LESS DENSELY HAIRY.
LEAVES	OPPOSITE; THE BLADES ENTIRE.
FLOWERS	CLUSTERED ON A RACHIS OF A LONG RACEME ON SHORT JOINTED STALKS. PERFECT FLOWERS IN EACH CLUSTER OF 1- 3; STERILE FLOWERS REDUCED TO FASCICLED HOOKS.
FRUITS	UTRICLE, ELLIPSOID, THIN WALLED, INDEHISCENT, 1- SEEDED.