(Non-official,)

Origin. - The leaves of Ruta graveolens L., an herbaceous or suffruticose perennial 2 or 3 feet (60 or 90 Cm.) high, indigenous in Southern Europe.

Description and Properties. - The leaves are ternate, the leaflets being obovate-oblong, yellowish-green, thickly dotted with minute, transparent oil-vesicles. They have a peculiar, strongly balsamic odor, and possess an aromatic, bitter, and acrid taste.

The principal constituent of rue is a volatile oil.

Dose. - 5-20 grains (0.3-1.3 Gm.).