The white rockrose is a rare cistus that
grows in two or three locations in Malta and in Gozo. It is closely related to
the hoary rockrose which has larger pink flowers.
This species is found in southern Europe
and North Africa. It grows in typical Mediterranean terrestrial habitats
including forests, woodlands, maquis and garigue. It is often cultivated as a
garden plant and in some parts of the world it has escaped from cultivation and
established itself as an alien species. In parts of California whwere the
climate is similar to that of the Mediterranean it has been so successful that
it has become an invasive species.
Its scientific name is Cistus monspeliensis which
means the Montpellier cistus which is actually an alternative name for this
plant especially in gardening circles.
The plant is well adapted for the
Mediterranean climate. It grows in the form of a low bush with thick, hairy,
glandular leaves which exude a sticky liquid. These characteristics help the
plant to conserve water during the long hot summer season when very little if
any rain falls.
Between April and May the bushes are
covered in a large number of beautiful white flowers.
The rockrose (or cistus) family to which
this plant belongs is composed of about 20 species. In some species the leaves
produce a highly aromatic resin known as labdanum.
This sticky liquid
has long been used in herbal medicine and as an ingredient in perfumery. In
some countries an infusion of the leaves is used to treat diarrhoea.
The resin is
extracted by boiling the leaves of a particular species or by dissolving it in
a solvent. An essential oil is obtained by steam distillation. The use of
labdanum has replaced ambergris which used to be obtained from the sperm whale,
an endangered species which is now protected.
This article was published in The Times of Malta on 17 April 2014.
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