A. Plant has a flower – B
A’. Plant lacks flower – Plant 1
B. Flower have petals – C
B’. Flower lack petals – Plant 4
C. Less than 4 petals
C’. At least 4 petals – D
D. 4 (white) petals – Plant 2
D’. 6 (purple) petals – Plant 3
Dichotomous key
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Thanks Alexis,
nice key. Really once you get to B. flowers have petals, there is not need to for the C an C’ statements, since there is no plant with less than 4 petals, so you could just use your D and D’ statements instead to separate plant 2 from plant 3 immediately after B. Flowers have petals – C.