Cassinopsis is a genus of flowering plants in the family Icacinaceae (order Icacinales), native to the Afrotropical realm — spanning southern Africa, Madagascar, and Mauritius. The genus comprises six to seven species of lanky, evergreen shrubs, small trees, or scrambling lianes that favour well-watered, moister habitats. Plants may carry spines and bear opposite leaves. The genus was described by the German botanist Otto Wilhelm Sonder in 1860. Notable species include Cassinopsis ilicifolia (Lemonthorn), a spined straggling shrub of southern Africa whose serrated leaf margins resemble holly (Ilex); Cassinopsis madagascariensis from Madagascar; Cassinopsis tinifolia from Mauritius; and Cassinopsis ciliata. The genus name reflects its resemblance to the related genus Cassine.
Etymology
The genus name Cassinopsis suggests its resemblance to the genus Cassine, another member of the Celastraceae/Icacinaceae alliance. The suffix -opsis is Greek for "appearance" or "resemblance." The genus was named by the German botanist Otto Wilhelm Sonder, who described it in 1860. The specific epithet of the type species Cassinopsis ilicifolia refers to its holly-like (Ilex) serrated leaf margins.
Distribution
Cassinopsis is an Afrotropical genus, with species distributed across southern Africa (including South Africa, where C. ilicifolia occurs in moister regions), Madagascar (C. madagascariensis), and Mauritius (C. tinifolia). The genus contains approximately six to seven accepted species, all restricted to sub-Saharan Africa and the western Indian Ocean islands.
Ecology
Members of Cassinopsis are evergreen plants that favour well-watered, moister habitats within the Afrotropical region. C. ilicifolia, the most widely observed species, is a spined, straggling shrub or liane found in moister parts of southern Africa. The genus occupies woodland margins, forest edges, and riparian zones.
Taxonomy
Cassinopsis belongs to the family Icacinaceae in the order Icacinales. The genus was described by German botanist Otto Wilhelm Sonder in 1860 and contains six to seven accepted species. It is placed in the asterid clade of flowering plants. Historically, the genus has sometimes been associated with Celastraceae due to its resemblance to Cassine, but modern molecular phylogenetics supports its placement within Icacinaceae.
