PSC 2620: Woody Trees and Shrub | Course Home | Study Materials |
Quercus gambelii - The leaf is 3-6 inches long, obovate in shape and has 5-9 deep and irregular lobes. The leaf is a dark glossy green and thick and leathery. | Quercus macrocarpa - The leaf is 4-10 inches long and obovate in form with very irregular rounded lobes. |
Quercus robur - The leaves are 2-5 inches long and have the classic oak leaf form. |
Quercus gambelii - The acorns are elongated and two-thirds of the nut is covered by the involucre. | Quercus macrocarpa - The acorns form in clusters and are 1/2 - 1 inch long. One-half of the nut is covered by the involucre. |
Quercus robur - The acorns form in clusters and are 1/2 to 1 inch long and elongated in shape. The involucre covers less of the nut than in the other Quercus species. |
Quercus gambelii - The bark is gray-brown in color and has ridges and furrows. Young bark is smooth and dark red in color. | Quercus macrocarpa - The bark is gray brown and very rough, with many deep furrows and ridges. The mature bark forms quickly, even on young branches. |
Quercus robur - The bark is deeply furrowed and gray-brown in color. |
Quercus gambelii - It grows 10-25 feet tall with the width slightly narrower. The form is very irregular. Image: Cory Maylett | Quercus macrocarpa - The tree grows 50-70 feet tall with a similar spread. It has a rounded form. |
Quercus robur - It grows 50-70 feet high and wide and has a good broad, rounded form and a clean branching pattern. |