Ochna is a genus of approximately 79 species of evergreen trees, shrubs, and shrublets belonging to the family Ochnaceae, within the order Malpighiales. The genus is distributed across the Old World Tropics, with species found in sub-Saharan Africa, Madagascar, the Mascarene Islands, the Arabian Peninsula, the Indian subcontinent, Indo-China, and southeastern China. Members of the genus grow in tropical woodlands and range from small shrublets to medium-sized trees.
The genus is best known for its distinctive fleshy drupelet fruits, which turn glossy black at maturity and are held on a fleshy, bright red, enlarged calyx. This arrangement, in which the dark drupelets sit atop a red star-shaped receptacle, resembles the face of the cartoon character Mickey Mouse, giving rise to the popular common names "Mickey-mouse plant" and "bird's-eye bush." The flowers are typically bright yellow with five petals, appearing before or with the new leaves.
Notable members include Ochna serrulata (carnival ochna or Mickey-mouse bush), widely cultivated as an ornamental shrub, and Ochna integerrima (yellow Mai flower), which holds cultural significance in Vietnam where it is a traditional symbol of the Lunar New Year. Ochna holstii (red ironwood) is a valued timber tree in East Africa. The genus was first described by Linnaeus, and its name is derived from the Greek ὄχνη (ókhnē), a word used by the ancient poet Theocritus for the wild pear, in reference to the leaf shape.
Etymology
The genus name Ochna derives from the ancient Greek word ὄχνη (ókhnē), used by the poet Theocritus to denote the wild pear. The name was applied because the leaves of Ochna species resemble those of the wild pear in appearance.
Distribution
Ochna species are distributed across the Old World Tropics, occurring in sub-Saharan Africa, Madagascar, the Mascarene Islands, the Arabian Peninsula, the Indian subcontinent, Indo-China, and southeastern China. The genus is primarily associated with tropical woodland habitats.
Ecology
Members of Ochna typically inhabit tropical woodlands and bushveld. The fleshy, brightly coloured fruits attract birds, which are likely the primary seed dispersers. Several African species, such as Ochna holstii, are components of montane forest and woodland edges.
Cultivation
Ochna serrulata and Ochna integerrima are the species most widely grown as ornamentals. They are valued for their bright yellow flowers and the striking red-and-black fruits that follow. Most cultivated ochnas prefer full sun to partial shade, well-drained soils, and a warm, frost-free climate. Ochna serrulata has become naturalised in parts of Australia and South Africa and is considered a weed in some regions. Ochna integerrima is a traditional flowering plant for the Vietnamese Lunar New Year (Tết), particularly in southern Vietnam.
