1. Leaves needle-like or scale-like Group A
1. Leaves broad and flat, never needle-like or scale-like.
2. Leaves compound (divided into 3 or more leaflets) Group B
2. Leaves simple.
3. Leaves opposite or whorled Group C
3. Leaves alternate.
4. Leaves neither toothed nor lobed Group D
4. Leaves toothed or lobed or both.
5. Leaves toothed but not lobed Group E
5. Leaves lobed Group F