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Genus Moquiniastrum 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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Moquiniastrum (Cabrera) G. Sancho belongs to Asteraceae (subfamily Asteroideae, tribe Astereae) (POWO, 2024; WFO, 2024; Robinson, 2004) and comprises about 30 species. The genus occurs across temperate South America, from the lowland pampas of Argentina and Uruguay to the Andean foothills and high‑altitude grasslands of Chile, preferring dry scrub, open woodland and alpine meadows up to ca. 3000 m (Sancho et al., 2019). The name was reinstated by G. Sancho to segregate taxa previously placed in Baccharis and Moquinia.

Diagnostic traits separate Moquiniastrum from Baccharis: plants are woody shrubs with alternate, simple leaves that are linear to lanceolate, often revolute and densely tomentose beneath; stipules are absent. Heads are solitary or in small, often secund cymes, always discoid, with one or two series of phyllaries; all florets are bisexual and tubular, the corolla narrowing into a throat before five short lobes. The ovary is inferior, uniloculate with basal placentation, and the fruit is a ribbed cypsela topped by a conspicuous pappus of fine capillary bristles, usually white to pale brown (Sancho et al., 2019).

Species richness peaks in the Argentine and Chilean Andes, with many narrow endemics confined to particular mountain massifs or high‑elevation grasslands; the genus shows a clear south‑temperate distribution and avoids tropical lowlands, occupying sandy pampa soils as well as nutrient‑poor alpine substrates (WFO, 2024). The prominent pappus suggests wind‑assisted seed dispersal, and observed pollinators are mainly generalist bees and flies attracted to the tubular corollas; chromosome counts are sparse but indicate a base number x = 9, typical for Astereae (Sancho et al., 2019).

Molecular work places Moquiniastrum as monophyletic within the Baccharis complex, confirming its generic status (Sancho et al., 2019). No formal subgeneric ranks are widely used, although a few authors treat the group as a section of Baccharis (Maciñ, 2020). Alternative circumscriptions retaining some species in Baccharis remain debated.

The genus has limited horticultural use; a few taxa such as Moquiniastrum glomeratum are occasionally planted as drought‑tolerant groundcovers, but it provides no timber or food.

Several Andean endemics are threatened by land conversion and grazing, and many lack red‑list assessments. Ongoing phylogenetic and field studies will be crucial for clarifying species limits and directing conservation priorities.

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