A) Tree or shrub with needle-like leaves. Flowers in cones. #1
A*) Tree, shrub or herb with leaves of diverse form. Flowers with perianth, ovules enclosed in ovary. B
B) Flowers without petals. #4
B*) Flowers with petals. C
C) Stem terminating in a single purple flower with 6 petals. #3
C*) Stem terminating in a cluster of white flowers with 4 petals each. #2