A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora

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A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora by John M. Coulter.

U. S. Department of Agriculture Division of Botany CONTRIBUTIONS FROM THE U. S. NATIONAL HERBARIUM Vol. III--No. 2 Issued June 10, 1894 Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora. by John M. Coulter. Published by Authority of the Secretary of Agriculture Washington Government Printing Office 1894 LETTER OF TRANSMITTAL U. S. Department of Agriculture Division of Botany Washington, D. C., March 21, 1894 SIR: I have the honor to transmit herewith, for publication as Vol. III, No. 2, of Contributions from the U. S. National Herbarium, a Preliminary Revision of the North American species of Cactus, Anhalonium, and Lophophora, by President John M. Coulter. Respectfully, Frederick V. Coville, Chief of the Division of Botany. Hon. J. Sterling Morton, Secretary of Agriculture.

PRELIMINARY REVISION OF THE NORTH AMERICAN SPECIES OF CACTUS, ANHALONIUM, AND LOPHOPHORA. Prefatory Note. In the fall of 1890 Dr. George Vasey, then Botanist of the Department of Agriculture, arranged with me to prepare a revision of North American Cactaceae. Owing to the peculiar difficulty of preserving material the family was poorly represented, even in our leading herbaria. To secure a large amount of additional material in the way of specimens and field notes the Department authorized me to visit the region of the Mexican boundary during the summer of 1891. Preliminary to this exploration it was necessary to examine the Engelmann collection of Cactaceae, in the possession of the Missouri Botanical Garden. This collection, supplemented by the continual additions made at the garden, is by far the largest collection of skeletons and living specimens in this country, and also contains the large majority of our types.

In March, 1891, I visited this collection and made such notes as seemed necessary for use in the field, and in June, accompanied by Mr. W. H. Evans and Mr. G. C. Nealley, I began field work in the neighborhood of El Paso, Tex.

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