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Genus Duhaldea in Tribe Inuleae

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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Duhaldea (DC.) is a small genus of the Asteraceae, placed in the tribe Gnaphalieae as recognised by the Angiosperm Phylogeny Group (APG IV 2016). The group comprises roughly ten to twelve species of shrubby, often densely tomentose perennials that occupy the high‑Andean region from Colombia to central Chile and adjacent Argentina, occurring from montane scrub to alpine grasslands at elevations of 2 000–4 000 m. The type species for the genus is Duhaldea candelabrum (Willd. ex Pers.) DC., a Chilean shrub widely cultivated in rock‑garden collections (POWO 2024; WFO 2024).

Morphologically, Duhaldea is distinguished by its woody habit, opposite (or occasionally sub‑opposite) leaves that are covered with a soft, felt‑like indumentum, and small capitula arranged in dense cymes or panicles. The capitula lack ray florets and are composed solely of tubular disc florets that are typically white to pinkish; the corolla tube is narrow and bears a short, slightly reflexed lip. The involucral bracts are arranged in several series, are linear‑lanceolate, and usually have a membranous margin. The ovary is inferior with a single basal ovule, and the fruit is an achene crowned by a pappus of numerous capillary bristles that facilitates wind‑dispersal. Stipules are absent, a characteristic of most Asteraceae.

The centre of diversity lies in central‑southern Chile, with several species endemic to the Andean cordillera and to the Patagonian foothills; a few taxa extend into Argentina, Bolivia and Peru, reflecting a typical Andean‑Patagonian biogeographic pattern (GBIF 2024). Species typically grow on acidic, rocky or sandy substrates and are adapted to seasonal drought and cold, traits reflected in their thick, silvery indumentum.

Pollination is carried out by generalist insects—mainly bees and flies—while the pappus‑equipped achenes are wind‑carried, a dispersal strategy common in Gnaphalieae. Chromosome numbers of 2n = 18 (base number x = 9) have been reported for Duhaldea candelabrum and related taxa, confirming the tribe‑typical base number.

Recent systematic work continues to treat Duhaldea as an independent genus; POWO 2024 and WFO 2024 both list it as accepted, while earlier treatments (e.g., several 20th‑century floras) merged it with Pseudognaphalium. Molecular phylogenies place Duhaldea as sister to a core South‑American clade within Gnaphalieae, supporting its circumscription despite on‑going taxonomic refinements (APG IV 2016). Some species boundaries remain unsettled, and synonymisation proposals have not been widely adopted.

In horticulture the genus is valued for its silvery foliage and modest, inconspicuous flower heads, making it suitable for alpine and rock‑garden settings, though none of its members are used as food crops or timber sources. Conservation concerns centre on the narrow endemics that face habitat loss from mining, grazing and climate‑induced shifts; field surveys and population monitoring are identified as priority research needs.

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