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Genus Lepidaploa in Tribe Vernonieae

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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Lepidaploa (Cass.) Cass., a genus of the Asteraceae family in the tribe Eupatorieae, includes approximately 150 species of perennial herbs and subshrubs (POWO, 2024; WFO, 2024). The plants are native to the Neotropics, ranging from southern Mexico to northern Argentina, with the greatest richness in the Brazilian Cerrado and adjacent Atlantic Forest (Pruski, 1996). Cassini’s original description fixed Lepidaploa auriculata as the type species (Pruski, 1996).

Morphologically, Lepidaploa is recognised by a fine lepidote indumentum on stems and leaf undersides. Habit is herbaceous with a woody base; leaves are simple, opposite or alternate, short‑petiolate, and usually entire to shallowly dentate; stipules are absent. Inflorescences are discoid capitula, solitary or in corymbose to paniculate clusters; involucral bracts occur in two to four series and often bear resinous glands. Flowers possess a five‑lobed corolla, elongated anther appendages, and style branches with sweeping hairs; the inferior ovary contains a single basal ovule. The fruit is a ribbed achene crowned by a pappus of numerous capillary bristles that facilitate wind dispersal (Robinson, 1995).

The genus is most diverse in the savanna‑woodland matrix of central Brazil, where many narrow endemics occupy specific mountain massifs or river valleys. Additional species occur in moist lowland forest and cloud forest up to about 2 000 m elevation, and the distribution shows classic disjunctions between the Amazon basin and the Andes (Loeuille et al., 2019).

Biological observations indicate pollination primarily by bees and butterflies, and the pappus enables long‑distance wind transport of seeds. Chromosome counts for several taxa consistently report a base number x = 9, with most diploids having 2n = 36 (Robinson, 1995).

Taxonomically, Pruski (1996) re‑circumscribed Lepidaploa, transferring many species formerly placed in Vernonia and Critoniopsis. Recent molecular phylogenies support monophyly of the genus but reveal that historical sectional groupings (e.g., sections Lepidaploa and Stenocladus) do not correspond to clades (Loeuille et al., 2019). Alternative classifications retain Vernonia sensu stricto for a subset of South American taxa and keep Critoniopsis separate, reflecting unresolved relationships.

A handful of Lepidaploa species with showy heads are occasionally cultivated as ornamental perennials, while others are considered weeds in agricultural settings because of prolific seed production.

Conservation concerns centre on habitat loss from agriculture and deforestation; several narrowly endemic taxa are assessed as vulnerable, and comprehensive field inventories remain incomplete, underscoring the need for further study and protection measures.

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