What does the A in MAD HORSE stand for?

The A in MAD HORSE stands for Ash, which is a tree characterized by its opposite leaf arrangements. Ash trees typically have compound leaves that are arranged in pairs along the stem, distinguishing them from trees with alternate or spiral leaf arrangements. This aspect of its leaf structure is essential for identifying the species within the context of forestry and understanding tree classification. Recognizing the leaf arrangement is a critical skill in dendrology, which helps in accurately identifying various tree species in Pennsylvania's diverse forests.