Using a key is like following the branches
of a tree-- each additional branch gets smaller and smaller until
you reach a single branch tip.
All the species described in a tree are represented by the trunk,
while each branch tip represents a single species of tree.
To identify a tree, first decide whether it
is a conifer or broadleaf...
- Conifers have needlelike or scale-like leaves and usually bear
seeds inside woody cones;
- Broadleaves usually have wide, flat leaves and bear their seeds
inside of soft fruits.