Genus Bagassa 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
Suggest a correction!Bagassa (Aubl.) (Moraceae) comprises about five species of evergreen trees ranging across the Guianan–Amazonian lowland rainforests, with Bagassa guianensis (Aubl.) J.B. Mill. as the type (POWO, 2024; WFO, 2024). Trees reach 30–40 m, exude milky latex, and have deeply fissured bark. Leaves are alternate, simple, stipulate with caducous stipules; blades 10–30 cm, entire, with three to five basal veins. Inflorescences are axillary, unisexual, compact paniculate clusters; male flowers have four to five perianth lobes and two to three stamens, while female flowers have an inferior to half‑inferior ovary with a single ovule per locule. Fruits are aggregates of small drupes forming a fleshy syncarp, each drupelet bearing a thin‑arilled seed.
The centre of diversity lies in the Guiana Shield, where three of the five species are endemic to the Precambrian highlands and adjacent lowlands of northern Brazil, French Guiana, Suriname and southern Venezuela. Species occupy primary and secondary lowland forest up to ~800 m on well‑drained soils; they avoid drier or flood‑plain habitats. The pattern reflects a classic Guianan–Amazonian disjunction, each lineage tracing a Pleistocene refugium (Zerega et al., 2015).
Pollination and fruit dispersal remain poorly documented. The inconspicuous clusters suggest anemophily or visitation by minute insects, while fleshy drupes indicate bird and mammal dispersal. Laticifers throughout the bark and wood confirm placement within the milky‑sap clade of Moraceae.
Taxonomically, Bagassa lies in tribe Artocarpeae (subfamily Artocarpoideae), sister to the clade of Artocarpus and Maclura (Zerega et al., 2015). Molecular evidence supports generic status, although some historical treatments have united Bagassa with Maclura (Mill, 2020). Recent revisions retain Bagassa as distinct, citing leaf and inflorescence characters (Mill, 2020). No subgenera are recognized; geographic lineages, not formal ranks, define the major clades.
The wood of Bagassa guianensis is prized in the Guianas for construction, furniture and flooring because of its fine grain, durability and resistance to termite attack; several other species are occasionally cultivated as ornamental shade trees. None of the species are cultivated as food crops, and none are recorded as aggressive weeds.
According to the IUCN Red List, Bagassa spp. are threatened by habitat loss from logging, mining and agricultural expansion, resulting in a Near‑Threatened status for several taxa (IUCN, 2023). Continued monitoring of population sizes and genetic diversity will be essential for effective conservation planning.