Aerides is a genus of approximately 25 species of tropical orchids in the family Orchidaceae (subfamily Epidendroideae, tribe Vandeae, subtribe Aeridinae), commonly called cat's-tail orchids or fox brush orchids. The genus is native to warm lowland tropics of Asia, ranging from India and Nepal through southern China, Southeast Asia, the Philippines, and into New Guinea.
Plants are predominantly monopodial epiphytes — growing on trees rather than in soil — though one species, Aerides krabiense, is a lithophyte. They lack pseudobulbs and instead produce leathery, distichous (two-ranked) leaves on a vine-like stem that can grow quite large. The leaf margins are bilobed and the apex emarginate. Morphologically, Aerides closely resembles the genus Vanda, to which it is closely related within the subtribe Aeridinae.
The genus is prized in horticulture for its pendulous racemes of many long-lasting, waxy, and fragrant flowers. Flowers are typically white with purple or pink edges, though some species bear predominantly pink, purple, or yellow blooms. Each flower has a distinctive forward-facing spur. Plants bloom from June to July.
The type species, Aerides odorata, was described by the Portuguese botanist João de Loureiro in 1790 and remains one of the most widely cultivated members of the genus. The generic abbreviation used in the horticultural trade is Aer.
Etymology
The name Aerides is derived from the Greek word for "air," reflecting the epiphytic habit of the species — plants that grow perched on trees, with roots exposed to the open air rather than anchored in soil. The genus has been abbreviated Aer in the horticultural trade.
Distribution
Aerides grows across tropical Asia, with species recorded in India, Nepal, Bhutan, Bangladesh, southern China (Yunnan, Guangdong, Guangxi, Guizhou), Sri Lanka, the Andaman and Nicobar Islands, Myanmar, Thailand, Laos, Vietnam, Cambodia, the Philippines, Malaysia, Indonesia, Sulawesi, Borneo, Timor, and New Guinea. Most species occur in warm lowland forest habitats.
Ecology
Species grow as epiphytes on trees in tropical lowland and montane forests, flowering from June to July. Temperature requirements vary among species from cool to warm growing conditions. Aerides krabiense is a notable exception, growing as a lithophyte on rock surfaces. The genus overlaps in range and ecology with the closely related genus Vanda.
Cultivation
Most Aerides species are considered straightforward to cultivate. They are popular as cut flowers and potted plants due to their long-lasting, fragrant blooms. Plants grow best in hanging baskets, teak containers, or net pots that allow roots to extend freely into the air. Well-drained media — such as tree fern fiber, fir bark, or sphagnum moss — are recommended. Plants require full sunlight and warm temperatures, and roots should be watered regularly. Root systems are sensitive and do not tolerate disturbance. The vine-like monopodial growth habit means plants can quickly become large.
