Haplopappus is a genus of flowering plants in the family Asteraceae (the daisy or composite family), within the order Asterales. The genus is native to South America, where it is largely confined to arid and semi-arid environments along the Southern Andes, the Chilean Matorral shrubland, and Patagonia.
Members of Haplopappus are typically shrubby or herbaceous perennials bearing the characteristic composite flower heads of the Asteraceae, with yellow ray and disc florets. The genus name reflects its morphological simplicity relative to related composites.
The taxonomic history of Haplopappus has been substantially revised: a large number of species formerly placed here have been transferred to other genera, including Ericameria, Grindelia, Isocoma, Machaeranthera, Xanthisma, Hazardia, and many others. The circumscription accepted by Plants of the World Online retains a core group of South American species. GBIF currently recognises approximately 84 descendant taxa under the genus.
Distribution
Haplopappus is found in South America, primarily in the dry regions of the Southern Andes, the Chilean Matorral, and Patagonia. Its range is largely restricted to arid and semi-arid habitats at mid to high elevations in Chile and adjacent areas.
Taxonomy Notes
The genus has undergone extensive reclassification. Many species once assigned to Haplopappus are now recognised in separate genera, including Acamptopappus, Ericameria, Grindelia, Hazardia, Isocoma, Machaeranthera, Oonopsis, Xanthisma, and more than twenty others. The current circumscription, as accepted by Plants of the World Online, restricts Haplopappus to a core of South American species.
