What are the 8 levels of classification for plants?

Petunias are in the family of solanaceae which is also potatoes, tomatoes and nightshade. The petunia genus is Petunia Juss. The three species are Petunia x atkinslana D. Don ex Loudon, Petunia axillaris Lam. Britton, Sterns & Poggenb. (which is a large white petunia) and petunia intergrifolia (violet flower)

Then there are four petunia groups: grandiflora, multiflora, milliflora, and groundcover petunia like 'Wave' and 'surfinia'.