Aerangis, abbreviated as Aergs in horticultural trade, is a genus of the Orchid family (Orchidaceae). The name of this genus has been derived from the Greek words 'aer' (air) and 'angos' (urn), referring to the form of the lip. It is the type genus of the subtribe Aerangidinae. Approximately 50 species in this genus are known mostly from tropical Africa, but also from the Comoro Islands, Madagascar and Sri Lanka. (Wikipedia)