Topics in North American Botany, A Symposium Commemorating George Engelmann: The Thirty-First Annual Systematics Symposium
Topics in North American Botany, A Symposium Commemorating George Engelmann: [Introduction], p. 503
Marshall R. Crosby
Instructions for the Collection and Preservation of Botanical Specimens, pp. 504-507
George Engelmann
Changing Botany in North America: 1835-1860 The Role of George Engelmann, pp. 508-519
Elizabeth A. Shaw
Augustus Fendler (1813-1883), Professional Plant Collector: Selected Correspondence with George Engelmann, pp. 520-531
Michael T. Stieber; Carla Lange
The Ever-Changing Landscape of Cactus Systematics, pp. 532-555
Arthur C. Gibson; Kevin C. Spencer; Renu Bajaj; Jerry L. McLaughlin
Yuccas and Yucca Moths-A Historical Commentary, pp. 556-564
Herbert G. Baker
Cenozoic History of Some Western American Pines, pp. 565-641
Daniel I. Axelrod
A Historical Sketch of the Vegetation of the Mojave and Colorado Deserts of the American Southwest, pp. 642-651
Robert F. Thorne