STUDIES IN AMERICAN ORCHIDS: II. THE GENUS BRACHIONIDIUM LINDL.

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Abstract
The genus Brachionidium is one of the most poorly defined taxa in the whole Vegetable Kingdom. The obscurity displayed in the type descriptions of B. parvifolium, B. tuberculatum, and B. concolor has prevented systematists from understanding the genus properly and from studying its position and relationship among the genera of Pleurothallidinae. The genus originally included the three above-named species. With the aid of photographs of types, recent collections have been classified. In addition to these, five new species are described, all from tropical America, viz. from the Andean Region. In addition to the complete revision of this genus, and its immediate relationship, special attention is given to all 20 genera of the subtribe Pleurothallidinae. The interrelation of these genera is examined and illustrated from a dynamic point of view.

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