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Genus Quesnelia in Family Bromeliaceae

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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Quesnelia (Gaudich.) is a tank-forming bromeliad in the family Bromeliaceae, subfamily Bromelioideae (Barfuss et al., 2020; Givnish et al., 2010). The genus comprises approximately 22 species, endemic to eastern Brazil, especially the Atlantic Forest and coastal restingas (POWO, 2024; WFO, 2024; Versieux, 2009). The type species is Q. quesneliana (Gouda, continuously updated).

Plants are monocarpic rosettes, usually terrestrial or saxicolous in open habitats rather than true epiphytes (Till et al., 2006). Leaves are long, stiff, and keeled, with coarse marginal spines and a dense layer of adaxial trichomes that confer a silvery appearance; young leaves often appear glaucous (Luther, 1998; Versieux & Leme, 2006). Scapes are well developed, bearing compact to pyramidal inflorescences with conspicuous bracts that range from scarlet to pale pink or yellow. Flowers are sessile or short-pedicellate, with free or partially fused sepals, imbricate petals that are green to yellow or pink, and conspicuous exerted stamens and style (Luther, 1998). The ovary is superior to half-inferior with axile placentation; fruit is a fleshy berry; seeds are minute and dispersed by birds (Barfuss et al., 2020; Luteyn, 1995).

Species richness concentrates in the Serra do Mar region, with several taxa restricted to inselbergs or coastal sandplains; altitudinal ranges span sea level to around 800 m, with diversity maxima in moist, warm-temperate forest and dry restinga mosaics (Versieux, 2009; Santos-Silva et al., 2013). Inflorescence coloration and floral structure point to hummingbird pollination, though precise vectors vary by species (Barfuss et al., 2020). Seed morphology and berry fruit indicate passive dispersal by birds following fruiting (Luteyn, 1995). Chromosome numbers in Bromelioideae commonly have a base of x=25; counts of 2n=50 have been reported for some Quesnelia species (Till et al., 2006). Most species flower annually and regenerate after senescence of the rosette, though quantitative demographic data remain scarce.

Within Bromelioideae, Quesnelia appears nested in the “q- Clade” sensu Barfuss et al. (2020), broadly allied to genera such as Neoregelia and Nidularium, though exact interfamilial resolution differs among plastid and nuclear datasets (Barfuss et al., 2020; Givnish et al., 2010). No formal sectional scheme is widely adopted, and several species have been re-circumscribed following taxonomic revisions in Atlantic Forest endemics (Versieux, 2009; Versieux & Leme, 2006). Alternative treatments occasionally merge Quesnelia with Aechmea or redirect certain species toCryptanthus (e.g., Luther, 1998; Gouda, continuously updated), but current consensus retains Quesnelia as distinct based on inflorescence architecture and ovary position (Barfuss et al., 2020).

Horticulturally, Quesnelia is popular for bold inflorescences and textured foliage; Q. quesneliana and Q. edmundoi are common in cultivation (Luther, 1998). No species are major crops or timber sources, and none are recognized as invasive (Till et al., 2006; Gouda, continuously updated).

Atlantic Forest fragmentation poses the principal threat to most species; red-list assessments indicate numerous narrowly distributed taxa (Leme & Marigo, 1993; Santos-Silva et al., 2013). Field-based phylogenetic and demographic studies are needed to refine conservation priorities as climate and land-use pressures intensify.

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