Thad: the rose is the center dot on the die.. the only dice that have that center point.. are the 1, 3 and 5.. the one has no petals meaning outter dots.. the 3 has two, and the 5 has four.. you simply add all the petals in the roll.

So.. for instance if you roll a 6, 6, 3, 2, 5 you would have 6 petals..
A roll of 1, 2, 2, 5, 5.. would = 8 petals..
A roll of 3, 3, 1, 3, 5.. would = 10 petals..