Ancistrochilus is a genus of the orchid family (Orchidaceae), comprising only two species native to tropical Africa. It belongs to tribe Collabieae within subfamily Epidendroideae and was described by the British botanist Robert Allen Rolfe. The genus is characterized by sympodial growth with distinctive conical to pyriform pseudobulbs, each bearing two to three broad, lanceolate leaves that are deciduous after the growing season. The inflorescences are pubescent and arise from the base of mature leafless pseudobulbs, producing three to four large, fragrant flowers up to 8 cm across. The flowers have dark rose-pink petals and sepals with a striking three-lobed magenta lip that terminates in an elongated, narrow, curved projection — a feature that gives the genus its name (from the Greek for "hook lip"). The two recognized species, Ancistrochilus rothschildianus and Ancistrochilus thomsonianus (the type species), are epiphytic orchids of tropical West African to East African forests, found growing on tree trunks and large branches at elevations of 500 to 1,100 meters.
Etymology
The name Ancistrochilus derives from the Greek words ankistron ("hook") and cheilos ("lip"), referring to the characteristic elongated, curved projection at the tip of the flower's lip. The name was published by Robert Allen Rolfe.
Distribution
Ancistrochilus is native to tropical Africa, ranging from West Africa eastward to Tanzania and Uganda. The two species are found growing as epiphytes on tree trunks and large branches in forested habitats at elevations between 500 and 1,100 meters.
Ecology
Ancistrochilus species are epiphytic orchids adapted to cool to hot tropical forest conditions. They grow on the trunks and large branches of trees at mid-elevations (500–1,100 m) in seasonally dry tropical forests. The plants are deciduous, shedding their leaves during dormancy, and flower from the base of leafless pseudobulbs.
Cultivation
Ancistrochilus species are cool to hot growing orchids that can be cultivated by hobbyists. Like many sympodial epiphytic orchids, they require a well-draining medium, bright indirect light, and a seasonal rest period corresponding to their natural deciduous cycle. The fragrant flowers, up to 8 cm across with dark rose-pink petals and a magenta lip, make them attractive subjects for orchid collections, though they are rare in cultivation.
Taxonomy
Ancistrochilus is a small genus of only two species (A. rothschildianus and A. thomsonianus, the type). It is placed in tribe Collabieae within the orchid subfamily Epidendroideae, following the classification of Chase et al. (2015). The genus was established by Robert Allen Rolfe. Wikipedia's taxonomy follows APG IV, placing Orchidaceae in order Asparagales.
