Alsobia is a small genus of flowering plants in the family Gesneriaceae, belonging to the order Lamiales. Native to the tropical regions of Mexico, Guatemala, and Costa Rica, the genus comprises succulent, stoloniferous herbs — plants that spread by horizontal runners (stolons) and have fleshy, moisture-retaining tissue. The genus contains three accepted species, with GBIF recognising three descendants.
Alsobia species were formerly placed within the closely related genus Episcia, but molecular phylogenetic studies have demonstrated that Alsobia forms a distinct lineage and warranted its separation. The most widely cultivated species, Alsobia dianthiflora (syn. Episcia dianthiflora), is notable for its white, fringed flowers that resemble those of a carnation (Dianthus), which is also the source of its specific epithet. Alsobia punctata (syn. Episcia punctata) is distinguished by spotted floral markings, while Alsobia chiapensis is named for the Mexican state of Chiapas where it occurs.
As members of Gesneriaceae — a family that includes African violets (Saintpaulia) and gloxinias — Alsobia species share the family's characteristic irregular, tubular flowers adapted for pollination by hummingbirds and insects in their Central American forest habitats.
Distribution
Alsobia is native to Mexico, Guatemala, and Costa Rica, occurring in tropical forest habitats of Mesoamerica.
Taxonomy Notes
Alsobia was formerly treated as part of the genus Episcia. Molecular studies have supported its recognition as a distinct genus within Gesneriaceae (order Lamiales). Key species such as A. dianthiflora and A. punctata retain Episcia synonyms reflecting their original placement.
Cultivation
Alsobia species, particularly A. dianthiflora, are cultivated as ornamental houseplants prized for their trailing stolons and fringed white flowers. They are grown similarly to other Gesneriaceae members: in bright indirect light, with well-draining growing medium, and moderate humidity. Their stoloniferous habit makes them well suited to hanging baskets.
