Gum rockrose (Cistus ladanifer) belongs to the Cistaceae (the Rockrose family). It is a evergreen shrub that is native to the western Mediterranean region. This herb grows in fields and grasslands, and can reach 1-2.5 m in height. The leaves are lanceolate, dark green and opposite. The flowers are five-petaled, white, usually with a red to maroon spot at the base, and bloom in summer. Its leaves yield a fragrant oleoresin known as labdanum, used in perfumes.