Burning Bush (Euonymus alatus) stems and habit. Younger stems have pronounced corky wings aligned with the axis of the stem, positioned at 90 angles with respect to each other, creating 4 sets of wings per stem. The stems are green. The wings become less pronounced with age. Multiple plants can be part of the same root system. Still planted as an ornamental for its red fall color, this Asian shrub has become invasive in urban and suburban forest remnants. Photo taken with Keeba the dog on February 13, 2013 in Morris Park, Philadelphia.