1A: Has needles; woody; cones present….Plant 1
1B: No needles present….Go to 2
2A: Has flowers with petals….Go to 3
2B: Petals absent; incomplete flower….Plant 4
3A: 4 petals, white; gamosepalous; inferior ovary….Plant 2
3B: 6 petals, purple; polysepalous; superior ovary….Plant 3