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A Reappraisal of the Oncidioid Orchids
Mark W. Chase
Vol. 11, No. 3 (Jul. - Sep., 1986), pp. 477-491
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2419085
Page Count: 15
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Floral morphology has been the mainstay of orchid systematics, often to the exclusion of all other information. Vegetative features and chromosome number only rarely have been used in tribal, subtribal, and generic classification. Such has been the case in the oncidioid orchids, in which lip size, shape, and angle of attachment to the column often have been the sole determinants of generic affinities. A realignment of the oncidioid genera is presented and based on a series of previously under-utilized floral characteristics (e.g., the general form of lip calli, nectaries, and pollinaria), vegetative morphology, life history traits, and chromosome number. Two anomalous genera, Lockhartia Hook. and Trichocentrum Poeppig & Endl., are also discussed in relation to the two main lineages, as exemplified by Rodriguezia Ruiz Lopez & Pavon and the 56-chromosome species of Oncidium Sw.
Systematic Botany © 1986 American Society of Plant Taxonomists