I designed these cards to help introduce the elusive world of identifying trees and plants. Leaves are a great place to observe the plant kingdom.
 
A leaf is the only thing in our known world that can manufacture sugar out of materials—light and air—that have never been alive. All the rest of us are secondary users, recycling the stuff the plant has made.
 
Leaves are perhaps one of few things in our world whose overcrowding is appreciated. Learning to tell to tell them apart is first step to ID plants or trees.