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The genus Tolumnia (formerly included in the genus Oncidium) is native to the Caribbean region. Many species grow in fairly dry areas suspended in mid air with their long roots entwined throught the small branches of scrub bushes. The roots absorb morning dew, which is then stored in the thick leaves. In captivity the plants must be grown in such a way that the roots dry very quickly, so small 1 or 2 inch diameter clay pots filled with loose, well draining media such as a mix of charcoal and bark are often used.