I've always thought of Roselia's roses being it's hands. I thought of maybe each 'finger' being a single petal which, when clenched into a fist, forms a rose.
I always thought that Roselia's roses were it's "hands". If you look closely at Roselia's RSFRLG sprite you can see that at the end of the arm, just before the rose, the arm is splayed outwards. It is quite clear that the roses grow from these.
Actually that would make sense. If the sprite has the roses coming out of its wrists then maybe the hands are on the inside. Its definatley not holding onto them like pompoms or we'd have seen its hands.
Roselia's hands ARE its roses, the little hand like thing you can see attached to one of its roses on the RS sprite is where the flower attaches to the rest of the plant, most flowers have them, anyways, for all we know, there could just be a huge flower center thing (can't think of the word) under its rose petals