Rydberg, one of the most productive scientists at the New York Botanical Garden during its first century, possessed a wealth of knowledge on the flora of the Rocky Mountain region & the Great Plains of North America. This Memoir celebrates the man & his deeds & includes a 215- item bibliography.

Composed of the Report of the director and other administrative officers, together with occasional contributions on scientific subjects. Beginning in 1933 the annual report of the director was published in its journal.

In the summer of 1891, Per Axel Rydberg and his assistant, Julius Hjalmar Flodman, collected plants in western Nebraska for the United States Department of Agriculture. They collected many first-records for Nebraska as well as some that became type specimens of Rydberg's and other botanists' names. In the following autumn and winter, Ryd-berg made a detailed, typewritten, carbon copied 35-page Report and 37-page List of specimens from that trip; one carbon copy is in the Bessey Herbarium (NEB) at the University of Nebraska-Lincoln. It is these documents that we present here, extensively annotated with our geographic clarifications, original and updated nomenclature, and citations of specimens in NEB and elsewhere.

Vols. for 1933-41, 1945 includes the Annual report of the director, 1933-40, 1944.