Genus Chukrasia 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!Chukrasia is a small tree genus in the mahogany family Meliaceae that currently comprises a single accepted species, Chukrasia tabularis A.Juss., the type of the genus (POWO, 2024; WFO, 2024). It occurs from the Indian subcontinent through Myanmar, Thailand, Laos, Vietnam, Malaysia and Indonesia, inhabiting low‑land to lower‑montane tropical forest up to roughly 1 500 m elevation (Flora of China, 2008). The species is widely cultivated for its valuable timber and sometimes used in reforestation programmes.
Morphologically the genus can be recognized by its alternate, once‑pinnate leaves bearing two to four opposite leaflets that are lanceolate, entire and glabrous or sparsely pubescent; stipules are absent. The terminal inflorescence is a branched panicle of small, greenish‑yellow flowers. The calyx is cupular and five‑lobed, the five petals are free, and the ten stamens are united into a conspicuous tube. The superior ovary is five‑locular with axile placentation, each locule containing two ovules. The fruit is a woody, five‑valved capsule that dehisces when mature, releasing flattened, winged seeds adapted for wind dispersal (Flora Malesiana, 2015).
Diversity is modest: Chukrasia is essentially monotypic, with only occasional intraspecific variants recognized in some regional treatments (Pennington et al., 2021). The centre of diversity lies in the Indo‑Burma hotspot, where most populations are encountered in semi‑evergreen to evergreen forest on well‑drained soils. The species shows a disjunct pattern, occurring both on the Indian subcontinent and across the Sundaic region, a pattern mirrored by several other Meliaceae (Muellner et al., 2019).
Intrinsic biology of the genus is typical of many Meliaceae: the tubular stamens suggest specialist pollination by bees or other insects, and the winged fruits facilitate anemochory. Chromosome counts from southern Chinese material report 2n = 44, indicating a base number x = 11 (Liu & Huang, 2020). This count is consistent across sampled populations and aligns with the broader Meliaceae tendency toward polyploidy.
Taxonomically, Chukrasia has never been subdivided into subgenera or sections; recent phylogenetic work places it as an early‑branching lineage within subfamily Melioideae, close to genera such as Aglaia and Swietenia (Muellner et al., 2019). Historical proposals to merge the genus with Swietenia (e.g., Swietenia tabularis) have been rejected on morphological grounds (Harley, 2016). Current consensus maintains Chukrasia as a distinct, monotypic genus (Pennington et al., 2021).
Human relevance is primarily economic: the reddish‑brown, fine‑grained wood is prized for furniture, veneer and interior joinery, and the species is planted ornamentally in parks and gardens. It is not a major food crop, nor is it considered invasive; however, over‑exploitation for timber has placed pressure on natural populations.
The species is assessed as Vulnerable on the IUCN Red List because of habitat loss and unsustainable logging (IUCN, 2021). Conservation actions focus on sustainable harvesting, habitat protection and monitoring of regeneration, yet gaps remain in understanding its demographic dynamics and genetic diversity. Continued research on cultivation techniques and population genetics will be essential for its long‑term persistence.