Access

You are not currently logged in.

Access JSTOR through your library or other institution:

login

Log in through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

A Reappraisal of the Oncidioid Orchids

Mark W. Chase
Systematic Botany
Vol. 11, No. 3 (Jul. - Sep., 1986), pp. 477-491
DOI: 10.2307/2419085
Stable URL: http://www.jstor.org/stable/2419085
Page Count: 15
  • Read Online (Free)
  • Download ($12.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Reappraisal of the Oncidioid Orchids
Preview not available

Abstract

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.

Page Thumbnails

  • Thumbnail: Page 
477
    477
  • Thumbnail: Page 
478
    478
  • Thumbnail: Page 
479
    479
  • Thumbnail: Page 
480
    480
  • Thumbnail: Page 
481
    481
  • Thumbnail: Page 
482
    482
  • Thumbnail: Page 
483
    483
  • Thumbnail: Page 
484
    484
  • Thumbnail: Page 
485
    485
  • Thumbnail: Page 
486
    486
  • Thumbnail: Page 
487
    487
  • Thumbnail: Page 
488
    488
  • Thumbnail: Page 
489
    489
  • Thumbnail: Page 
490
    490
  • Thumbnail: Page 
491
    491