Aerangis (abbreviated Aergs in the horticultural trade) is a genus of approximately 50 species of small orchids in the family Orchidaceae, order Asparagales. The genus was described by Heinrich Gustav Reichenbach in 1865, with Aerangis flabellifolia as the type species, and is the type genus of the subtribe Aerangidinae, which has been subsumed into the broader subtribe Angraecinae.
Species are usually epiphytic, growing on trees, and occasionally lithophytic, growing on rocks. They are native primarily to tropical Africa, with additional species found on the Comoro Islands, Madagascar, and Sri Lanka. In appearance they somewhat resemble Vandas: plants bear a single stem with six to ten fleshy, parallel-veined, evergreen leaves arranged in two rows.
The flowers are among the most striking in the orchid family — large, waxy, and star-shaped, typically white or cream-colored, occasionally yellow. Each flower carries a conspicuously long spur, often exceeding the length of the flower itself, filled with nectar. The lip is flat and closely resembles the petals and sepals. Flowers are borne on long racemes and release a sweet, agreeable fragrance at night, attracting long-tongued hawk moths as pollinators.
In cultivation, Aerangis species are valued for their elegant, pendant flower sprays and nocturnal fragrance. Although not as widely grown as some orchid genera, they are considered relatively easy to cultivate, and around 15 species are commonly available to collectors. The genus has also participated in numerous intergeneric hybrids, including ×Angrangis (Aerangis × Angraecum), ×Amesangis (Aerangis × Amesiella), and ×Thesaera (Aerangis × Aeranthes), among others.
Etymology
The genus name Aerangis derives from the Greek words aer (air) and angos (urn), a reference to the distinctive urn-like shape of the flower's lip.
Distribution
Aerangis species are found predominantly in tropical Africa, with additional species native to Madagascar, the Comoro Islands, and Sri Lanka. The roughly 50 known species span a range of humid, forested environments at varying elevations across sub-Saharan and east Africa.
Cultivation
Aerangis orchids are considered relatively straightforward to cultivate despite their exotic origins. Approximately 15 species are regularly available in specialist collections. They are typically grown mounted or in well-draining bark mixes to replicate their epiphytic habit, and perform best in intermediate to warm temperatures with high humidity and good air movement. Their night-fragrant flowers make them particularly rewarding windowsill or greenhouse subjects.
Taxonomy Notes
Aerangis was described by Heinrich Gustav Reichenbach in 1865, with Aerangis flabellifolia as the type species. It is the type genus of the subtribe Aerangidinae, which recent phylogenetic work has subsumed into the subtribe Angraecinae (tribe Vandeae, family Orchidaceae). The genus has given rise to at least six registered intergeneric hybrid genera.
