Scaphyglottis (abbreviated Scgl.) is a genus of roughly 70 orchid species in the family Orchidaceae (order Asparagales), native to Mexico, Central America, the Caribbean, and much of South America as far south as Bolivia and Brazil.
The genus is defined by a unique growth habit among sympodial orchids: new pseudobulbs arise not only from the base of the previous ones but also from their apices, producing distinctive stacked, superposed chains. The plants are epiphytic or occasionally lithophytic, ranging from a few centimetres to nearly one metre tall. Each slender, elongated pseudobulb is sheathed at the base by numerous thin, deciduous scales and bears up to three long, narrow leaves at its tip.
Flowers are generally small and inconspicuous — nearly always white, cream, pale green, or soft lavender — though the two species formerly placed in Hexisea (now merged into Scaphyglottis) produce striking brilliant-red blooms. Petals and sepals are of similar length, the lip being the largest perianth segment. Each flower carries a terminal anther containing four to six pollinia. Most species are insect-pollinated, with nectar collected in the hollow formed by the base of the lip and the column; the red-flowered species may also be visited by hummingbirds.
The genus was described by Eduard Friedrich Poeppig and Stephan Ladislaus Endlicher in 1835. Its circumscription has expanded over time through the synonymisation of several smaller genera, including Tetragamestus, Leaoa, Hexadesmia, and Hexisea. Because many species form complexes of morphologically similar, reproductively isolated groups, identification can be difficult. A handful of intergeneric hybrids (greges) have been registered, among them crosses with Domingoa and Epidendrum.
Etymology
The name Scaphyglottis derives from the Greek skaphe (meaning concave or hollow) and glotta (tongue), a reference to the distinctive concave shape of the floral labellum. The genus was formally published by Poeppig and Endlicher in 1835; its type species, Scaphyglottis graminifolia, was designated by Robert Louis Dressler in 1960.
Distribution
Scaphyglottis ranges from southern Mexico and the Caribbean Islands southward to southern Bolivia and much of Brazil. The genus spans an unusually wide altitudinal gradient — from hot, humid tropical rainforests near sea level through drier upland forests up into Andean cloud forests. The centre of species diversity is concentrated in southern Central America, where species typically grow high in the tree canopy or in other well-lit positions.
Taxonomy Notes
Scaphyglottis was published by Poeppig and Endlicher in 1835 and has been progressively broadened to absorb several formerly independent genera. Tetragamestus, Leaoa, and Hexadesmia were synonymised decades ago; a 1993 revision further clarified species limits without completing full synonymy. The genus now also encompasses Hexisea, source of the two brilliant-red-flowered species previously thought distinct. Many species form morphologically cryptic complexes of reproductively isolated groups, making delimitation challenging. A handful of registered intergeneric hybrids (Scaphingoa, Seahexa, Epiglottis) document the genus's compatibility with Domingoa and Epidendrum.
