Dichotomous Key

A. Cones present, leaves are needles……………………………………………… Plant 1

A’. Cones not present, leaves are not needles – B

B. Complete flowers, perianth visible to naked eye – C

B’. Incomplete flowers ……………………………………………………………. Plant 4

C. Petals white, many flowers per stem ………………………….. Plant 2

C’. Petals violet, one flower per stem …………………………….. Plant 3