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Genus Iguanura in Family Arecaceae

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

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Iguanura (Blume) belongs to the Arecaceae and comprises about 22 species in peninsular Thailand, Peninsular Malaysia, Singapore, and Borneo, with a center in northern Borneo (POWO, 2024; Lim, 2011). The type species is Iguanura wallichiana (Mart.) Blume (POWO, 2024; Lim, 2011). The genus is easily recognized by its predominantly caulescent, clustering palms bearing simple, pleated leaves with reduplicate vernation, and by its interfoliar, unisexual, paniculate inflorescences bearing spirally arranged cincinni that bear conspicuous bracteoles; flowers have a very small tricarpellate gynoecium with axile placentation and fleshy, usually red to orange drupes with a thin endocarp and a small, fusiform seed (Kiew, 1975; Lim, 2011).

Iguanura is most diverse in Borneo (about 15 species), with additional local radiations in Peninsular Malaysia and southern Thailand; many taxa are narrow endemics of lowland dipterocarp, kerangas, or peat-swamp forests, occurring from sea level to c. 1,300 m, with a few species restricted to ultramafic or limestone substrates (Lim, 2011). Fruit coloration, size, and the presence or absence of hooked bracteoles offer reliable species-level characters (Kiew, 1975; Lim, 2011). The base chromosome number is inferred as x=16 for Arecaceae as a whole (Dransfield et al., 2005), with counts not yet documented for Iguanura. Pollination is almost certainly by insects given the fragrant, small white to cream flowers (Lim, 2011), whereas dispersal appears to be by birds and small mammals, reflected in brightly colored drupes and understorey fenology (Lim, 2011).

Taxonomically, the genus is placed in tribe Hyphaeneae of subfamily Coryphoideae by Dransfield et al. (2005), although detailed phylogenetic placement remains sparse. Kiew (1975) initially recognized a broad concept, while Lim (2011) refined the circumscription, describing multiple new species and clarifying synonymy; alternative treatments (e.g., earlier local Floras) sometimes differ in species limits, reflecting the group’s subtle morphological variation and ongoing revision (Kiew, 1975; Lim, 2011; WFO, 2024). No formal infrageneric groups are consistently applied. Horticulturally, several Iguanura species are highly sought after as ornamentals for their compact habit, distinctive leaves, and colorful infructescences; I. wallichiana and I. geonomiformis are particularly familiar in cultivation (Lim, 2011). Otherwise the genus is not of major economic importance, and no Iguanura species are regarded as invasive.

Conservation remains a priority: many species are narrow endemics threatened by lowland deforestation and peat swamp drainage, with some poorly known taxa likely exceeding IUCN thresholds for threatened categories (Lim, 2011; POWO, 2024). Improved phylogenetic resolution and targeted field surveys will be essential to guide future protection and cultivated use (Lim, 2011; Dransfield et al., 2005).

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