Maxillaria, large genus of tropical American orchids (family Orchidaceae). The genus traditionally has included more than 300 species, most of which are epiphytic and grow at high altitudes; however, the taxonomy of the group is contentious. Several species are cultivated for their fragrant flowers, including the coconut orchid (Maxillaria tenuifolia), crowded maxillaria (M. densa), light fox-red maxillaria (M. rufescens), and variable maxillaria (M. variabilis).

Members of the genus come in a variety of forms. Some species are less than 5 cm (2 inches) tall, but others may grow to nearly a metre (about 3 feet). The pseudobulbs (bulblike stems) vary in position, shape, and size, depending on the species, but usually are flattened and spaced along a creeping rhizome. The leaves are thick and leathery and are usually borne singly from the top of each pseudobulb. Most species bear solitary flowers on short stalks emerging from the base of the pseudobulbs.

This article was most recently revised and updated by Melissa Petruzzello.
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orchid, (family Orchidaceae), any of nearly 1,000 genera and more than 25,000 species of attractively flowered plants distributed throughout the world, especially in wet tropics. Orchidaceae is a member of Asparagales, an order of monocotyledonous flowering plants that also includes the asparagus and iris families. The word orchid is derived from the Greek word (orchis) for testicle because of the shape of the root tubers in some species of the genus Orchis. These nonwoody perennial plants are generally terrestrial or epiphytic herbs (i.e., growing on other plants rather than rooted in soil). Those attached to other plants often are vinelike and have a spongy root covering called the velamen that absorbs water from the surrounding air. Most species manufacture their own food, but some live on dead organic material (saprotrophic) or are helped to obtain nourishment by a fungus living in their roots.

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