Genus Soymida in Family Meliaceae
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!Soymida is a monotypic genus in the mahogany family (Meliaceae) comprising a single species, Soymida febrifuga (Roxb.) A.Juss., designated as the type (Pennington & Styles, 1981). It occurs in India, Sri Lanka, Bangladesh and Myanmar, in tropical dry‑deciduous and moist lowland forest up to 800 m (POWO, 2024).
Trees reach 30 m with straight trunks. Leaves are alternate, paripinnate with three to six pairs of elliptic, glabrous leaflets; stipules are minute and caducous. Flowers occur in axillary panicles, each with five sepals, five petals, and a staminal tube bearing ten anthers. The superior ovary is five‑locular with axile placentation and two ovules per locule. The fruit is a woody, dehiscent capsule that splits into five valves, releasing flattened, winged seeds (Pennington & Styles, 1981).
The genus is largely confined to the Western Ghats of India, with isolated populations in the Eastern Ghats, central India and Sri Lanka. It inhabits dry deciduous woodlands and riverine margins, occasionally moist lowland forest, reflecting its documented regional pattern (Kumar et al., 2018).
Flowers attract generalist insects, and the winged seeds disperse by wind over moderate distances. No base chromosome number for Soymida is well established, and traits such as fire‑tolerance have not been recorded (Muellner et al., 2006).
Soymida is placed in subfamily Melioideae; molecular phylogenetics resolve it as a sister lineage to a clade containing Aphanamixis and Melia (Muellner et al., 2006). The genus lacks formal subgenera. Historically some authors included it within Swietenia as a section, but modern revisions reject this placement (Pennington & Styles, 1981). POWO retains Soymida as an independent genus with no recent synonymisation (POWO, 2024).
The timber of Soymida febrifuga is prized for durability and attractive grain, used in furniture, veneer and construction; the tree is also planted as an ornamental shade tree in parks (Kumar et al., 2018). It is not listed as invasive and is cultivated rather than weedy.
Deforestation and selective logging, combined with limited protected‑area coverage, have resulted in a Near Threatened assessment (IUCN, 2023). Key research gaps include population genetics and sustainable silviculture. Continued monitoring and ex‑situ conservation will be essential for the species’ long‑term survival.