However, it does mention that she draws trees "in the back of her notebook, over and over, different shapes and sizes". This suggests that she's not drawing specific species, but rather exploring the general form and beauty of trees.
The focus of Melinda's drawings is not on the specific type of tree, but on the process of drawing itself as a means of expression and escape. It's a way for her to channel her emotions and feelings, and the trees serve as a symbol of her own internal struggles.
So, while the book doesn't reveal the exact tree species, it emphasizes the symbolic and emotional significance of Melinda's drawings.