Photographed along Sycamore Creek in the Pine Mountain Wilderness, Yavapai Co., Arizona, USA. 07 June 2009.
Small swellings called galls may occasionally be found on some leaves caused by the feeding of minute mites.
LEAVES: Winter deciduous, compound leaves have usually three or five, or
sometimes seven, dentate leaflets. Occasionally leaves are not divided down to
midrib and in that case are not compound; leaf morphology even on the same tree
can vary considerably. The shiny, dark green leaves could be mistaken by a
novice as poison ivy.
Aceraceae -- Maple Family
The Flora of Arizona's Sycamore Canyons