This sixth issue of the series of reports on The Botany of the Guayana Highland quickly follows Part V. Since that writing only one additional exploration has been completed.
In the autumn of 1962, Dr. Rogert McVaugh and Dr. Arthur Cronquist botanized together over a large part of Mexico, from Coahuila to Chiapas, and to both coasts. Dr. Cronquist's purpose was to learn something about the Compoitae of Mexico. He collected four undescribed species.
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