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Genus Selenicereus in Family Cactaceae

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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Selenicereus (A.Berger) Britton & Rose is a genus of vining epiphytic and lithophytic cacti in tribe Hylocereeae (subfamily Cactoideae), widely cultivated for their spectacular nocturnal flowers and edible fruits (Korotkova et al., 2021; Calvente et al., 2011). The complex includes several economically important species bearing the “pitahaya” of commerce; Selenicereus undatus is the type species of the commonly cultivated Hylocereus clade (Korotkova et al., 2021; Bauer & Walter, 2024).

Plants are scrambling climbers with segmented, usually three‑angled stems that root adventitiously, producing aerial anchors. Areoles bear short spines; leaves are reduced to minute scales, and conspicuous epicarpal bristles or spines develop on fruits. Flowers open after dusk and last a single night, with elongated floral tubes bearing numerous scaly bracteoles; tepals are spread, and stamens are dense and conspicuous. The inferior ovary is unilocular with numerous ovules on several parietal placentae. Fruits are globular to ovoid, pulpy berries, often pink to red at maturity, and contain numerous black seeds embedded in juicy aril tissue (Anderson, 2001). Pollen release and stigmatic receptivity are synchronized for nocturnal visitors; hawkmoths and occasionally bats are reported pollinators, whereas birds disperse the brightly colored fruits (Bauer & Walter, 2024).

The genus centers in southern Mexico and Central America with extensions into northern South America and the Caribbean; populations typically occur in lowland to lower montane dry and moist tropical forests up to roughly 1800 m (POWO, 2024; Calvente et al., 2011). Economic horticulture and fruit production have introduced Selenicereus widely in the Neotropics and in cultivation elsewhere (WFO, 2024). A base chromosome number of x=11 is widely cited for Cactaceae (n≈11 for several Hylocereeae lineages), though precise counts in this complex have not been consistently reported (Anderson, 2001).

Recent phylogenetic analyses have restructured Hylocereeae and support a broadened Selenicereus encompassing species previously placed in Hylocereus and several allied lineages, while segregating Weberocereus and recognizing Epiphyllum sensu stricto (Korotkova et al., 2021). Floral bracteole features and tepal curvature have emerged as diagnostic for segregate clades (Calvente et al., 2011). Alternative treatments retain Hylocereus for the edible‑fruit clade (e.g., S. undatus, S. costaricensis, S. megalanthus), a usage reflected in horticultural commerce and recognized as a major synonymy by some authorities (Bauer & Walter, 2024). Exact species limits remain uncertain, and the monophyly of certain sections needs further testing (Korotkova et al., 2021).

Beyond horticulture and edible fruits, Selenicereus contributes ornamental climbing cacti to horticulture; secondary metabolites and climbing architecture are discussed in studies of cactaceous economic botany (Anderson, 2001). Conservation status is largely unassessed; deforestation and land‑use change in lowland forests constitute primary threats, and precise distributional data are needed to prioritize future red‑list assessments (POWO, 2024; Calvente et al., 2011).

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