Rue
Easton's Bible Dictionary 1897
A garden herb (Ruta graveolens) which the Pharisees were careful to tithe (Luke 11:42), neglecting weightier matters. It is omitted in the parallel passage of Matt. 23:23. There are several species growing wild in Palestine. It is used for medicinal and culinary purposes. It has a powerful scent, and is a stimulant. (See MINT.)
Smith's Bible Dictionary 1863
International Standard Bible Encyclopedia 1915
roo (peganon): One of the plants mentioned in Lu 11:42 as subject to tithe: in the parallel passage, Mt 23:23, anise and cummin are mentioned. Ruta graveolens (Natural Order, Rutaceae) is the official rue, and a very similar species, R. chalepensis, is indigenous. Rue is a small shrub growing 2 to 4 ft. high with a heavy odor, disagreeable to Westerners, but a favorite with Orientals. A sprig of rue is often fixed on a child's cap or clothes as a kind of charm.