. Brigham Young University science bulletin. Biology -- Periodicals. 20 BRIGHAM YOUNG UNIVERSITY SCIENCE BULLETIN hundred years in age. The expansion of the clone is slow, perhaps as little as a foot is added to the margin per year. There is some evidence that Gambel oak is far more widespread now than it was a hundred years ago. (Christensen 1950.) The northern-most stands of Gambel oak are in Parry Canyon and near Mantua in southern Box Elder County, and Little Bear Canyon, Cache County. However, it appears that these may represent consid- erable extension of the range in the past hundred ye
. Brigham Young University science bulletin. Biology -- Periodicals. 20 BRIGHAM YOUNG UNIVERSITY SCIENCE BULLETIN hundred years in age. The expansion of the clone is slow, perhaps as little as a foot is added to the margin per year. There is some evidence that Gambel oak is far more widespread now than it was a hundred years ago. (Christensen 1950.) The northern-most stands of Gambel oak are in Parry Canyon and near Mantua in southern Box Elder County, and Little Bear Canyon, Cache County. However, it appears that these may represent consid- erable extension of the range in the past hundred years. Ferris, a very careful reporter, indicated that oak was not present in Ogden Hole (Huntsville Valley). Weber County in 1830 but today it is abun- dant on the foothills. (Christensen 1950.) Q. gambelii is generally not a species of the basin and range province in Utah, but it is present in the Mineral, Canyon, Sheeprock, and Oquirrh Mountains. Some of these colonies may be of great age, but Christensen (1950) suggests that others may have resulted from recent introduction of acorns by squir- rels or other animals. Gambel oak has long presented problems to the taxonomist. It is high variable species, which has been alternately considered as one species or treated as several species or subspecific taxa. (Rydberg 1922, Tucker 1961a). Today it is generally regarded as a highly polymorphic species which has hybridized readily with other oaks throughout the southeast. The discovery in 1954(Cottam& Drobnick 1955) of an unusual oak clone in the Oquirrh Mountains of UTAH OUTLINE MAP. northern Utah led to the study of its relationship to the Gambel oak with which it was associated to Q. tiirbinella of southern Utah which it resembled. It was determined that the unusual clone was a hybrid between these two oaks, a conclusion full of interest- ing implications inasmuch as one parental species, Q. litrbinella is 300 miles to the south (Cottam & Tucker 1956). The name proposed fo
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