Plant dichotomous key
Plant 1
Needles
Cones
Woody stem
No flowers
Plant 2
White flowers
4 petals
Plant 3
Purple flowers
Plant 4
Flower
No petals
A. Plant has no flowers (Plant 1)
A’. Plant has flowers
B. Plant has no petals (Plant 4)
B’. Plant has petals
C. Plant has white flowers (Plant 2)
C’. Plant has purple flowers (Plant 3)
Chelsea, I like your dichotomous key. It is very straight forward, clear and easy to follow. However, I think plant 1 has flowers, too.