PlantaeDB Logo
Login Sign-up

Genus Malesherbia in Family Passifloraceae

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).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Malesherbia Ruiz & Pav. (Passifloraceae) is a small but morphologically diverse Andean genus of erect shrubs and subshrubs comprising approximately 55–60 species (Medina et al., 2017). It is centered in the Andes of Peru and Chile, with secondary diversity in Bolivia and northwestern Argentina and a few disjunct taxa along the coastal Andes of northern Peru (Kocyan et al., 2007). The type species is Malesherbia fasciculata Ruiz & Pav., established at the original description (Ruiz & Pavón, 1794). Passifloraceae is here circumscribed following APG IV (2016) and recent family phylogenies (Tokuoka, 2012).

Malesherbia is diagnosed by freely branched, often rigid shrubs with stellate or dendritic indumentum, entire to shallowly lobed leaves lacking stipules, and pendent, actinomorphic, pentamerous flowers with a tubular to campanulate hypanthium. The corolla is typically salverform with spreading lobes, the androgynophore is well developed, and the inferior ovary is usually three-locular with parietal placentation; fruits are loculicidal capsules containing numerous minute seeds (Hunziker, 1977; Medina et al., 2017). These characters collectively distinguish it from most other Passifloraceae in South America, where Passiflora s.l. is more common, and are well documented across multiple regional treatments and revisions (Hunziker, 1977; Kocyan et al., 2007).

Species richness concentrates in the Atacama and Peruvian coastal deserts, as well as in Andean dry woodlands and puna. Notable centers of endemism include the Peruvian coast and the Andean valleys of southern Peru and northern Chile (Kocyan et al., 2007). Many taxa occur in arid, rocky, or sandy substrates at elevations from near sea level to over 3,500 m, with pronounced drought and cold tolerance reflected in their xeromorphic foliage and compact growth forms (Medina et al., 2017).

Intrinsic biology is incompletely documented. Flowers appear to be entomophilous, with the showy corollas and conspicuous androgynophores indicating visitation by insects, but formal pollination studies for Malesherbia remain scarce (Hunziker, 1977). Dispersal syndromes have not been explicitly treated; capsules and small seeds suggest abiotic dispersal and local run-off. Chromosome numbers are unconfirmed for the genus (Medina et al., 2017).

Major taxonomic work has treated Malesherbia as a single genus without subgenera, although sectional treatments have been proposed historically (Hunziker, 1977). Recent phylogenetic analyses place Malesherbia within the broad Passifloraceae s.l., recognizing its position but providing limited branch support to resolve deeper relationships (Tokuoka, 2012). Alternative circumscriptions that have segregated some Andean taxa into separate genera have not achieved consensus and remain contentious (Kocyan et al., 2007). POwo (2024) and WFO (2024) presently accept the genus in the same sense as recent regional treatments (Medina et al., 2017).

The genus has no major economic crops or timber value. A few species are cultivated as xerophytic ornamentals in specialized horticulture, but trade is limited and species-level misidentifications in cultivation are frequent. There are no documented invasive populations (GBIF, 2024).

Conservation concerns reflect limited distribution, habitat specificity, and ongoing desertification in coastal Peru and northern Chile. Data on population trends are sparse, highlighting a need for standardized field surveys and ex situ conservation. Future work integrating molecular phylogenomics with targeted ecological monitoring will be essential to stabilize the taxonomy and guide regional protection strategies.

Pick a Species to see its components: