Cytinus is a small genus of holoparasitic flowering plants in the family Cytinaceae, order Malvales. Unlike most plants, species of Cytinus produce no chlorophyll and are entirely dependent on host plants for water and nutrients, spending most of their life cycle hidden within the roots of their hosts and emerging above ground only to flower and fruit.
The genus comprises three accepted species and is distributed across the Mediterranean Basin and South Africa, with a possibly undescribed species in Madagascar. Mediterranean species — notably Cytinus hypocistis and Cytinus ruber — parasitize members of the rockrose family (Cistaceae), particularly Cistus and Halimium, with a high degree of host specificity: C. ruber is associated almost exclusively with pink-flowered Cistus albidus.
Above ground, Cytinus produces short, fleshy stems (3–12 cm) densely clothed in scale-like, imbricate leaves that are often strikingly carmine-red. The inflorescences bear up to 19 small flowers with a white to pale-pink perianth; fruits are small and fleshy with numerous ellipsoid seeds. The plants emerge from the soil in spring, flowering in April across much of their Mediterranean range.
Cytinus hypocistis has a long history of human use: its young shoots have been eaten as an asparagus-like vegetable, and extracts have been employed in traditional medicine as an astringent and to treat dysentery and throat ailments. Cytinus ruber is likewise edible and has been used in folk medicine as an emmenagogue.
Distribution
Cytinus occurs across the Mediterranean Basin — from Portugal and Morocco east to Turkey and Libya — and in South Africa. C. hypocistis is the most widespread Mediterranean species; C. ruber is found in the southern and eastern Iberian Peninsula, Balearic Islands, and along the broader Mediterranean coast to the Caucasus; a further undescribed species is known from Madagascar.
Ecology
Cytinus species are obligate root holoparasites with no photosynthetic capacity. They attach to the roots of host plants in the family Cistaceae, especially Cistus and Halimium, and emerge above ground only during the brief flowering period in spring. Cytinus ruber shows strong host specificity for Cistus albidus in the Iberian Peninsula; C. hypocistis parasitizes white-flowered Cistus species. Plants grow in scrubland (matorral) habitats, typically on calcareous substrates, from sea level to around 1200 m.
Cultural Uses
Young flowering shoots of Cytinus hypocistis have been collected and cooked as a substitute for asparagus. Extracts have been used in traditional herbal medicine as an astringent and as a treatment for dysentery and throat conditions. Cytinus ruber is also edible — its ovary pulp is reported as sweet — and has been used in folk medicine as an emmenagogue.
Taxonomy Notes
Cytinus was historically placed in Rafflesiaceae, the family of the giant holoparasites, but molecular studies relocated it to its own family Cytinaceae within the order Malvales. GBIF recognises three accepted species. Some authors have treated Cytinus ruber as a subspecies of C. hypocistis (C. hypocistis subsp. clusii), but differences in coloration, flower form, and strict host-plant specificity generally distinguish the two taxa.
