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Genus Richterago in Tribe Gochnatieae

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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Richterago (Asteraceae: tribe Asteraceae sensu lato) comprises about 26 accepted species (POWO, 2024; Brazilian Flora, 2020), centered in the campos rupestres of southeastern Brazil, with secondary representation in campo grasslands and restinga (POWO, 2024). The type species is Richterago radiata (Vell.) Kuntze (POWO, 2024). It is a genus of shrubs and subshrubs that are often resinous and aromatic. Leaves are simple, alternate, usually sessile, with entire margins, a leathery texture, and dense foliar indumentum of glandular and/or non-glandular hairs; stipules are absent. Capitula are homogamous and discoid, borne solitary or in dichasiform to thyrsoid synflorescences; involucral bracts are multiseriate, often keeled and glandular, and the receptacle is naked. Florets are exclusively disciform; corollas are actinomorphic with five lobes and are typically glabrous to slightly pubescent. The style branches are truncate with sweeping hairs, and the pappus consists of numerous scales. Fruits are cypselae, the ovary is inferior, and ovules are anatropous.

Diversity and range. Species richness concentrates in the campos rupestres of Minas Gerais, Bahia, and the Chapada Diamantina, with local centers of endemism in high-elevation rocky outcrops (Camargo et al., 2017). Populations occupy quartzite and sandstone rock fields, campo grasslands, and occasionally coastal or subcoastal restinga on sandy substrates, from near sea level to roughly 2000 m (Brazilian Flora, 2020). The Cerrado–Campos Rupestres transition contributes to the genus’s main biogeographic pattern of range-restricted, habitat-specialist taxa.

Intrinsic biology. Flowering is primarily during the wet season and pollinator networks have been documented to include generalist insects, consistent with homogamous heads; reliable quantitative data on pollen vectors and seed dispersal remain sparse. Chromosome numbers are not consistently reported across the genus and cannot be stated without explicit reference.

Taxonomy and phylogeny. Recent taxonomic treatments have broadened Richterago to include species formerly placed in Lychnophora and Eriocnema, supported by phylogenomic and morphological evidence (Loeuille et al., 2015;pirani et al., 2015), but this broad circumscription is not universally adopted (POWO, 2024). Alternative narrow concepts segregating Lychnophora and Richterago remain influential; the genus is therefore interpreted with circumscription-dependent variation in species number and sectional structure.

Human relevance. Several species are cultivated in the cut-flower trade for ornamental foliage and compact habit, and a subset has been evaluated for horticultural performance in nurseries (Lorenzi, 2019). No widespread weeds or invasive species are reported.

Conservation and outlook. Habitat loss from mining, agriculture, and altered fire regimes, compounded by small, fragmented populations, poses significant threats; targeted ex situ and in situ conservation actions are increasingly critical to maintain genetic diversity across disjunct distributions.

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