Flora of Eastern Tabasco and Adjacent Mexican Areas by Cyrus Longworth Lundell, published by the University of Michigan Press in September 1942, documents the botanical exploration of southeastern Mexico. Supported by the University of Michigan and Carnegie Institution of Washington, six expeditions surveyed regions like Yucatan, Campeche, and Tabasco, focusing on areas previously neglected by botanists. The study covers the flora of eastern Chiapas, eastern Tabasco, and western Campeche, collecting approximately 700 species. Notable areas include the Usumacinta and San Pedro Rivers, with expeditions detailing the forest types and plant species found. The book also includes studies of American spermatophytes, providing comprehensive insights into the region's vegetation and contributing significantly to botanical knowledge.