. Brigham Young University science bulletin. Biology -- Periodicals. Fig. 41. Quercus lurhinella Greene Quercus turbinella Greene (Fig. 41) On first glance at the small evergreen leaves, most Utahans would be surprised species is an oak. Characteristic of dry hillsides and canyons of extreme southwestern Utah, its rounded, blue-green form gives a distinctive cast to the areas where it is common. The northern limits of this species today is just over the Great Basin divide in the vicinity of Kanarra- ville, but there is some indication that this live oak once thrived as far north as Salt Lake C
. Brigham Young University science bulletin. Biology -- Periodicals. Fig. 41. Quercus lurhinella Greene Quercus turbinella Greene (Fig. 41) On first glance at the small evergreen leaves, most Utahans would be surprised species is an oak. Characteristic of dry hillsides and canyons of extreme southwestern Utah, its rounded, blue-green form gives a distinctive cast to the areas where it is common. The northern limits of this species today is just over the Great Basin divide in the vicinity of Kanarra- ville, but there is some indication that this live oak once thrived as far north as Salt Lake City and Ogden. Q. turbinella hybridizes freely with Q. gam- belii in Washington County and intermediate forms are common. The discovery of similar hybrid clones identical to these far to the north in the Oquirrh Mountains and elsewhere led botanists to suggest that during the period of higlier temperatuers following the most recent glaciation Q. turbinella grew in north- ern Utah and hybridized with Q. gambelii. As tem- peratures dropped, the live oak died out and only the hybrid clones remained. (Cottam, Tucker, and Drob- nick 1959.) Representative Specimens: Iron Co., Kanarraville, Droh- nick 14758, September 5, 1957 (UT): Kane Co., Dance Hall Rock, JR. Murdock 381, May 2, 1961 (BRY); Kane Co., Glendale, Cottam 14626, September 6, 1958 (UT); Washington Co., Beaver Dam Mts., /. Tidestrom 9329, May 9, 1919 (US). UTAH. holly that like this Fig. 42. Rhamnus hetulacfolia Greene Rhammis betulaefolia Greene (Fig. 42) Birch-leaf buckthorn is one of two species of Rhamnus present in Utah. The other, R. alnifolia, has recently been discovered in Big Cottonwood Can- yon near Salt Lake City. However, it is a shrub and out of the scope of this work. R. betulaefolia, on the other hand, is a small tree widely distributed in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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