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Genus Streblus in Family Moraceae

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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Streblus (Lour.) is a genus in the Moraceae (fig–mulberry family). It includes about twelve species of trees and shrubs (POWO, 2024) ranging across tropical Africa, South‑East Asia, and the western Pacific. The type species, fixed by the original description, is Streblus asper (Lour.) (Loureiro, 1790).

The plants have simple, alternate leaves that are often scabrous or finely pubescent and bear caducous stipules. Flowers are unisexual; male clusters form dense axillary catkins while female flowers are solitary or in small heads. The superior ovary bears a single basal ovule, a milky latex exudes when bark is cut, and the fruit is a small drupe with a persistent perianth (Clement & Nyffeler, 2020).

The centre of diversity lies in the Malesian region, where several taxa are endemic to lowland dipterocarp forest, riverine margins, or limestone outcrops. A small African clade includes Streblus usambarensis from the Eastern Arc. In Asia the genus ranges from Myanmar to the Philippines, generally below 800 m but occasionally in lower montane sites (POWO, 2024).

Observations suggest that small insects visit male flower clusters, indicating entomophilous pollination. The fleshy drupes are eaten by birds and mammals, implying vertebrate‑mediated seed dispersal (Li & Zonneveld, 2021). Chromosome counts for Asian taxa consistently give 2n = 28, indicating a base number of x = 14 (Mohan et al., 2019).

Molecular analyses place Streblus in the tribe Doronycheae, within the ‘old‑world’ Moraceae clade and sister to a Cudrania‑related lineage (Li & Zonneveld, 2021). Historically some authors merged Paratrophis and Cudrania into Streblus (Berg, 2005), whereas later treatments retain them as separate (Clement & Nyffeler, 2020). Recent recircumscriptions clarified species boundaries, though the status of several Asian taxa remains unsettled.

Several species, notably Streblus asper, produce light timber used locally for construction and tool handles, and some Asian taxa are planted as ornamental shade trees. No Streblus species serve as major food crops. Streblus pendulinus can act as a pioneer weed in coconut and oil‑palm plantations, sometimes requiring control (Berg, 2005).

Approximately half of the recognized taxa have limited distributions and are considered Near Threatened or Data Deficient. Habitat loss from deforestation and agricultural expansion remains the principal threat. Future work integrating molecular data with field inventories will be essential for updating conservation priorities (Clement & Nyffeler, 2020).

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