Trichocentrum, often abbreviated Trctm in horticulture, is a genus in the orchid family, Orchidaceae. It was described by Stephan Ladislaus Endlicher and Eduard Friedrich Poeppig in 1836; the type species is Trichocentrum pulchrum.
The pseudobulbs are reduced. The obtuse, fleshy leaves are 9 cm long. They are broadly elliptic to ovate-lanceolate.
The large, showy flowers grow basally on a short peduncle in a single-flowered to few-flowered raceme. They are white, or white covered with maroon dots. The petals and sepals are similar.
The long lip carries a short spur. This feature distinguishes the genus from other Oncidiinae, in which the spur is an extension of the column. The short column has a pair of apical wings on the stigma. The anther often bears minute papillae. There are two waxy pollinia, connected to elongate stipes.
Grow plants in cool to intermediate temperatures in partial shade to bright light. Water plant when mix drys. During the winter give plants a slight dryout between waterings. Water approximately once a week. Pot with medium fir bark.
There is disagreement as to the taxonomic status of some species that have recently been moved from Oncidium to Trichocentrum. Morphological characteristics of "typical" trichocentrums, such as being relatively small and squat with a short, few-to-several flowered inflorescence, contrasts sharply with the larger, heavier oncidiums with long, "mule-ear" leaves and showy, branched inflorescence with many flowers, or the "rat-tail" species with terete leaves.
While studies of molecular phylogeny has caused substantial re-classifications , it is uncertain whether this new scheme will be widely adopted. Like with many plants, hybrid isation might heavily confound cladistic analyses, though the exact extent is unknown. Hybridisation of Trichocentrum with Oncidium has resulted in the hybrid genus ×Trichocidium for example, and similar events in the past would result in unrealistic assessments of relationship based on molecular phylogenetic studies with too limited a scope.