Genus Aegle in Family Rutaceae
In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.
Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.
Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).
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Genus Description
Suggest a correction!Aegle (authority Corrêa) is a monotypic genus in the Rutaceae family (APG IV, 2016). The sole recognized species, Aegle marmelos (L.) Corrêa, is the type species (POWO, 2024; WFO, 2024). The tree occurs across the Indian subcontinent from Pakistan to Sri Lanka and has been introduced to Southeast Asia, East Africa and tropical America, persisting in cultivated settings. It occupies dry deciduous forest and scrub up to about 1200 m altitude (POWO, 2024).
Morphologically Aegle bears trifoliolate, alternate leaves that are glandular punctate, lack stipules and emit a citrus scent when crushed. The rachis is winged and the leaflets are lanceolate. Inflorescences arise in leaf axils as solitary or short panicles of small white flowers, each with five sepals, five free petals, a conspicuous disc and numerous stamens. The ovary is superior, five‑carpellate with axile placentation, and the fruit is a large, indehiscent drupe with a thick leathery rind and many seeds embedded in mucilaginous pulp (Singh & Singh, 1994).
Because it is monotypic, species richness is about one; the genus shows a center of diversity in the Indian subcontinent with secondary foci in cultivated populations worldwide. Wild individuals are confined to dry tropical forests and secondary scrub, while cultivated trees are common in orchards, parks and temple gardens.
Reproduction is entomophilous; bees and flies pollinate the fragrant flowers, and the heavy drupe drops to the ground where seeds are dispersed by mammals and humans. Chromosome counts are 2n = 18 (Singh & Singh, 1994). The tree is evergreen, reaching 10–15 m and living several decades.
Molecular phylogenies place Aegle within the Aurantioideae, close to Atalantia and Severinia (Samuel et al., 2004). Current treatments retain a monotypic circumscription (POWO, 2024; WFO, 2024); a minority suggest a second species, Aegle securidaca, but this remains unresolved (POWO, 2024). No formal subgeneric or sectional divisions have been proposed.
Aegle marmelos is cultivated for its edible fruit, used fresh, dried or as syrup; the wood is used for small tools and fuel, and the tree is planted as an ornamental. It is not invasive.
Wild populations face habitat loss and over‑harvesting, yet widespread cultivation ensures persistence; future work should assess genetic integrity of natural stands (POWO, 2024).