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Genus Bertolonia in Family Melastomataceae

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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Bertolonia (Raddi) is a small genus of the family Melastomataceae, comprising about 30 species of plants endemic to the Atlantic Forest of southeastern Brazil (POWO, 2024; WFO, 2024). The nomenclatural type is Bertolonia maculata Raddi, designated by later authors (Renner, 1995).

Species of Bertolonia are distinguished by opposite, simple leaves with a pronounced acrodromous venation pattern—three to five strong basal veins that arch toward the leaf apex— and by terminal or axillary inflorescences that may be solitary spikes or compact panicles. The five‑petaled flowers possess ten stamens with poricidal anthers that release pollen through terminal pores, a trait typical of buzz‑pollinating bees. The inferior ovary is five‑locular with axile placentation; the mature fruit is a fleshy, multi‑locular berry containing numerous minute seeds (Renner, 1995).

The genus shows high regional endemism, with most taxa confined to the montane forests and shrublands of the Atlantic Forest in the states of Rio de Janeiro, São Paulo, Minas Gerais and Espírito Santo. Species occur from sea level to around 1500 m, often on limestone outcrops or in shaded understorey (WFO, 2024). Several taxa are known from only one or two localities, reflecting both narrow ecological preferences and the fragmented nature of the remaining forest fragments (Silva et al., 2020).

The floral morphology indicates pollination by bees capable of vibrating the anthers (buzz pollination); field observations document bees as the main pollinators (Renner, 1995). Fruits are dispersed by birds that consume the fleshy berries, facilitating gene flow across forest patches (Silva et al., 2020).

Molecular phylogenies place Bertolonia within the tribe Miconieae as sister to the large genus Miconia, supporting its recognition as a distinct lineage (Michelangeli & Reginato, 2019). Historical treatments sometimes merged Bertolonia into Miconia (Renner, 1995), but current consensus, reflected in POWO and WFO, maintains it as a separate genus. No formally recognized subgeneric sections are widely accepted, and the circumscription relative to closely related genera remains the focus of ongoing systematic research.

Several Bertolonia species are cultivated for their ornamental foliage; the glossy, patterned leaves and compact habit make them popular in shade‑garden horticulture and as houseplants (Silva et al., 2020). The genus has no major timber or food significance.

Because most species depend on the highly fragmented Atlantic Forest, many are listed as threatened by habitat loss and stochastic events (POWO, 2024). Continued conservation, targeted surveys, and integration of molecular data into Red List assessments will be essential for safeguarding the genus.

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