Category: Science - Biology
The authors thank Bryan A. Jowers, Glendale, California, for the excellent winter silhouettes. For help in obtaining specimens or photographs of species not easily accessible to us, we thank the following: Roger W. Barbour, University of Kentucky; William Harlow, College of En...
The authors thank Bryan A. Jowers, Glendale, California, for the excellent winter silhouettes. For help in obtaining specimens or photographs of species not easily accessible to...
2. Part 21. Leaves compound, with blades divided into leaflets 2 1. Leaves simple, blades not divided into leaflets 7 2. Leaves with opposite arrangement on twigs 3 2. Leaves with altern...
3. Part 3Bark thin and dark green on young trees, becoming ash-gray and conspicuously furrowed and ridged with age. Branches spreading to ascending, often drooping on large open-grown tr...