In late 1949 Professor A. F. Vierheller, Extension Horticulturist at the University of Maryland, College Park, obtained two small pecans from an exhibit at the Prince Georges County Fair, Upper Marlboro, Maryland, which he sent to the Office of Nut Investigations at Beltsville, Maryland. These nuts were very thin shelled and contained solid, well developed kernels very light in color and attractive. We gave them no particular heed until the fall of 1951, when the authors together with Professor Vierheller, P. E. Clark, County Agent of Prince Georges County, visited the tree on which they had been produced. We found also a number of other pecan trees nearby. All of them were on an old southern Maryland estate known as Brookfield. The present owner is John C. Duvall, whose address is Naylor, a small southern Maryland community located about 25 miles southeast of Washington, D. C. in the heart of the tobacco growing area. _Origin of the Duvall trees_: The present trees probably grew from nuts sent to Maryland from the vicinity of Iron Mountain, Missouri, by a friend of the Duvall family named Mrs. Mary Medora Johnson. Mrs. Johnson had lived in Maryland as a neighbor of the Duvall family and when she moved to Missouri she apparently was so impressed with the native pecan that she sent nuts to her friends in Maryland for planting. This must have happened about 1850 since the oldest trees at Brookfield are estimated to be about 100 years old and Mrs. Johnson was a friend of John C. Duvall's grandmother. In terms of the human life span the trees are thus three generations removed from the time of planting, a time period which fits fairly well the estimated age of 100 years based upon size of the trees. _Description_: The three largest trees are approximately equal in size and undoubtedly represent the original planting. The eight other trees are all smaller and could well have originated as seedlings of the original three. Five of the largest trees have been given numbers 1 to 5 and will be referred to by number. Duvall No. 1, 2 and 5 are the three large trees situated more or less in a circle surrounding the old mansion, each about 100 yards from the others. The smaller trees are located more or less between and around the larger ones, the old mansion being on a slight knoll in the center of the planting. The original dwelling of Brookfield is now crumbling ruins, part of the building being more than 200 years old, according to Mr. Duvall, who lives in a modern new country home across the road from the original mansion. The three large trees have a diameter at breast height of approximately 4 feet and all of them have a branch spread of more than 150 feet. They are 75 to 100 feet tall. All of the trees have very narrow and pointed leaflets characteristic of Texas and southwestern varieties, and they are remarkably free of insect pests and diseases.