The Gum Rockrose

The Gum Rockrose (Cistus ladanifer) is a species of flowering plant in the family Cistaceae. It is a native of the western Mediterranean region. It is indigenous to Spain, Portugal and north-west Africa.

It is a shrub growing 1-2.5 m tall and wide. The leaves are evergreen, lanceolate, 3-10 cm long and 1-2 cm broad, dark green above and paler underneath. The flowers are 5-8 cm diameter, with 5 papery white petals, usually with a red to maroon spot at the base, surrounding the yellow stamens and pistils. The whole plant is covered with the sticky exudate of fragrant resin.

It is particularly well suited to the Continentalized Mediterranean climate, standing both long summer droughts and cold weather. It is an extremely invasive plant which has taken over much of former farmland and grasslands in the mountain regions of central Spain. In Spanish it is known as Jara pringosa meaning "sticky shrub."

C. ladanifer is placed within the C. salvifolius group within the white-flowered Cistus lineage. The wide distribution and morphological variation of C. ladanifer across northern Africa, the Iberian peninsula, and southern France has resulted in the recognition of three sub-species: subspp. ladanifer, sulcatus, and africanus.

Phylogenetic and divergence dating methods found that C. ladanifer diverged during the Pleistocene, long after the opening of the Strait of Gibraltar around 5 mya, which supports a hypothesis of dispersal for this species. Although its seeds fall close to the maternal plant, C. ladanifer may have successfully dispersed due to its preference for disturbed habitats.

It is a popular ornamental plant, grown for its strongly resin-scented foliage and conspicuous flowers. Its leaves yield a fragrant oleoresin known as labdanum, used in perfumes, especially as a fixative.





Source: http://en.wikipedia.org/wiki/Gum_rockrose

See also: Flowers Philippines, Flower Sydney, Flowers Brisbane