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Genus Cantinoa in Family Lamiaceae

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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Cantinoa (Lamiaceae: Nepetoideae: Ocimeae) is a Neotropical genus of herbs and shrubs centered in Brazil, with a few species extending along the Andes and across northern South America. Based on recent revisions and checklists, the group comprises roughly twenty species, most of them in Brazilian campos and cerrado. Cantinoa spicata is the type.

Morphologically the genus is diagnosed by a combination of non-resupinate flowers with a clearly gibbous, tubular corolla, an actinomorphic calyx with subequal teeth, and nutlets that lack mucilage when wet. The habit is herbaceous or suffrutescent, with opposite leaves and usually a terminal thyrsoid or pseudospicate inflorescence; bracts can be showy or inconspicuous. The inner wall of the calyx tube is glabrous or with only sparse indumentum, a character that contributes to its distinction from Hyptis s.l. The style is bifid and the fruits are schizocarpic, producing four nutlets.

Diversity concentrates in Brazil, particularly in the campos rupestres and coastal restinga, with secondary richness in the Andes and northern South America. The genus occupies relatively open habitats from near sea level to around 2000 meters, though many taxa are lowland.

Pollination is primarily by bees, with occasional visitation by hummingbirds in highland species; nuts fall and may be secondarily dispersed by ants. Chromosome base number is consistently reported as x = 8 (Pastore & Harley, 2012; J. Pastore, 2017).

Taxonomically, Cantinoa was segregated from Hyptis by Pastore & Harley, a re-circumscription supported by subsequent phylogenetic work on the Hyptis clade, which places Cantinoa close to Eplingiella and isolates it from the core Hyptis lineage (Harley & Pastore, 2012; Pastore & J.B. Walker, 2022). The group is accepted in the World Checklist of Lamiaceae and reflected in Kew/POWO and WFO/World Flora Online; GBIF occurrence data corroborate its distribution (Kew/POWO, 2024; WFO, 2024; GBIF, 2024).

Human relevance is limited: a few species are occasionally cultivated in botanical gardens and by enthusiasts, and C. mutabilis has been recorded as naturalized in parts of Africa, but the genus is not a major crop or timber source.

Conservation status remains largely unassessed for individual taxa; immediate threats include habitat loss in Brazil’s campos and the effects of climate change on high-elevation species. Refined threat assessments and integrative taxonomic resolution across its closely related genera remain pressing needs (Pastore, 2017; Pastore & J.B. Walker, 2022; GBIF, 2024).

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