Limonia acidissima (syn. Feronia elephantum, Feronia limonia, Hesperethusa crenulata, Schinus limonia) is the only species within the monotypic genus Limonia, native to India, Pakistan, Sri Lanka, and southeast Asia east to Java. Vernacular names include wood-apple, elephant-apple, monkey fruit, and curd fruit in English and a variety of names in the languages of its native area.
It is a small tree growing to 9 m tall, with rough, spiny bark. The leaves are pinnate, with 5-7 leaflets, each leaflet 25-35 mm long and 10-20 mm broad, with a citrus-scent when crushed. The fruit is a berry 5-9 cm diameter, and may be sweet or sour. It has a very hard rind which can be difficult to crack open, and contains sticky brown pulp and small white seeds.
A number of other species formerly included in the genus are now treated in the related genera Atalantia, Citropsis, Citrus, Glycosmis, Luvunga, Murraya, Microcitrus, Micromelum, Naringi, Pamburus, Pleiospermium, Severinia, Skimmia, Swinglea, and Triphasia .