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A Reappraisal of the Oncidioid Orchids

1986; American Society of Plant Taxonomists; Volume: 11; Issue: 3 Linguagem: Inglês

10.2307/2419085

1548-2324

Mark W. Chase,

Plant Diversity and Evolution

Floral morphology has been the mainstay of orchid systematics, often to the exclu- sion 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 deter- minants 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 anoma- lous genera, Lockhartia Hook. and Trichocentrum Poeppig & Endl., are also discussed in relation to the two main lineages, as exemplified by Rodriguezia Ruiz L6pez & Pav6n and the 56-chromosome species of Oncidium Sw.