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Genus Neurolaena in Tribe Neurolaeneae

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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Neurolaena R.Br. is a genus of Asteraceae comprising roughly 30 accepted species (POWO, 2024; WFO, 2024). It ranges from southern Mexico to northern South America, occupying lowland rainforest, montane cloud forest and secondary growth up to about 3000 m (GBIF, 2024). The type species is Neurolaena lobata (L.) Cass.

Plants are woody subshrubs or shrubs with opposite, simple leaves that are usually palmately lobed and bear sessile glandular hairs. Capitula are solitary or in small cymes, radiate, with yellow‑orange ray florets surrounding bisexual disc florets. The involucre has several overlapping bract series; the pappus is reduced to a few short scales or absent, and the linear‑ovate cypsela is typically glabrous with a minute basal callus (King & Robinson, 1979, 1987).

The highest species richness occurs in the Andean cordilleras of Colombia, Ecuador and northern Peru, where many taxa are narrow endemics of cloud‑forest ridges (POWO, 2024). Secondary diversity centers are in the Caribbean islands and the Guiana Shield. Typical habitats are shaded understorey of humid forest, forest edges and occasionally disturbed sites such as road verges. Elevations range from sea level to about 3 200 m (GBIF, 2024).

Florets attract generalist pollinators such as bees, flies and small butterflies. Seed dispersal is primarily wind‑driven; the reduced pappus can aid short‑distance travel, while some cypselae possess a minute basal elaiosome that may attract ants (Baldwin et al., 2003). Cytogenetic information is sparse.

Neurolaena belongs to the tribe Heliantheae, subtribe Neurolaeninae (King & Robinson, 1979, 1987). Molecular work places it as sister to Sclerocarpus, with only weak support for internal Andean relationships (Baldwin et al., 2003). Historically it has been merged with Sclerocarpus (King & Robinson, 1979, 1987), but current treatments keep the genera separate (POWO, 2024; WFO, 2024).

Neurolaena lacks major economic importance; it provides no timber, food crops or significant medicinal uses, and is only rarely cultivated. In parts of Central America it can colonise disturbed sites and is occasionally regarded as a weedy pioneer (GBIF, 2024).

Many narrow‑endemic species are threatened by habitat loss from deforestation and agriculture, yet comprehensive IUCN assessments are missing for most. Targeted field surveys, refined phylogenetic data and conservation planning are required to protect the genus’s diversity amid ongoing environmental change.

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