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Genus Nolana in Tribe Lycieae

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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Nolana L. is placed in Solanaceae, tribe Nolaneae, and includes about 26 accepted species (Dillon et al., 2015; Dillon et al., 2007; Tu et al., 2012). Nolana is a genus of herbaceous to shrubby coastal and desert plants native to the southern Atacama, Chilean matorral, and coastal Peru, with additional inland populations in the high Andes of northern Chile and adjacent Argentina (Dillon, 2007; Dillon et al., 2015). It is the sole genus in tribe Nolaneae and often regarded as monotypic at tribal rank; the family assignment has a long history of shifting between Solanaceae and the segregate Nolanaceae (Dillon et al., 2009; Olmstead & Bohs, 2007). Nolana paradoxa Lindley is widely treated as the type in modern usage (e.g., Dillon et al., 2007).

Morphologically, Nolana is recognized by its prostrate to spreading habit and the presence of large, fleshy leaves; leaves are alternate to opposite, simple to lobed, and often glabrous to glandular. The inflorescences are typically solitary or cymose, arising from leaf axils, and have five-lobed campanulate to rotate corollas that are blue to violet or yellow with a distinct white throat. The gynoecium is typically 5-carpellate with superior to half-inferior ovaries; each carpel often contains a single ovule, so fruits are schizocarpic with mericarps that adhere to a central axis. The nutlets are often invested with a wing-like margin derived from the pericarp (Tu et al., 2009; Dillon et al., 2007). Gynoecial fusion is partial, giving rise to the characteristic nutlets that are diagnostic within Solanaceae (Tu et al., 2012).

Species richness is concentrated in the Atacama Desert and central Chile, with endemics restricted to the Chilean coast and the high Andes. Habitats range from salt flats and dunes to scrub and xeric slopes, with sea-level populations near constant oceanic influence and inland populations in high-elevation desert (Dillon et al., 2015). At least one species, N. rostrata, is documented to have base chromosome number x=12 (Sühs & Martínez, 1991). Pollination appears to be by specialist bees in coastal species, and dispersal is by water or wind via the winged mericarps, although comprehensive functional data remain sparse (Tu et al., 2012).

Taxonomically, Nolana has been subdivided into sections including Nolana sect. Nolana and sect. Sphacelata, and species delimitation has been revised with molecular phylogenetics (Dillon et al., 2007; Tu et al., 2009; Dillon et al., 2015). Phylogenetic work supports monophyly of the genus and its position as sister to the remainder of Solanaceae in tribe Nolaneae, while placing the tribe within the “early-diverging” grade of Solanaceae (Olmstead & Bohs, 2007; Tu et al., 2012). Despite well-supported clades, species boundaries remain fluid, and synonymization differs among treatments (Tu et al., 2009; Dillon et al., 2015). The historic separation of Nolanaceae versus placement within Solanaceae is the subject of ongoing synthesis in family-level systematics (Olmstead, 2013).

Nolana has horticultural relevance, especially N. paradoxa and its allies, which are cultivated as ornamental groundcovers valued for showy flowers and drought tolerance (Dillon et al., 2015). Some weedy tendencies are noted for coastal species, though invasion dynamics remain limited in scope (Dillon, 2007). There are no major timber or crop uses, and medicinal claims should be avoided.

Conservation status varies locally, and coastal development and mining in the Atacama pose threats. A notable research gap is comprehensive pollination ecology and dispersal effectiveness across coastal–inland gradients (Dillon et al., 2015; Tu et al., 2012). Future work integrating fine-scale ecology with phylogenomics should refine species boundaries and inform conservation priorities (Dillon & Tu, 2021).

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