Genus containing around 54 evergreen shrubs, subshrubs and stemless perennials grown predominantly for their bright orange or yellow flowers, which have 1 plane of symmetry down the centre and 5 differently sized petals which are fused to around half their lengths and appear more like 3 lobed petals. These plants are cultivated mainly for their bright blooms, these are also produced in a range of other colours including red, pink and white but orange and yellow shades are most common. Leaves are oval in shape, glossy and may be covered in hairs, they are arranged oppositely or in whorls. Leaf edges are smooth or undulating. Originally from Africa, Madagascar, Arabia and India, species in this genus are cultivated as houseplants in temperate climates.