Aestivation.
The arrangement of the parts of a flower within the bud, usually referring to sepals and petals.
Valvate.
With the margins adjacent without overlapping.
Imbricate.
Petals (or sepals) overlapping, as in a tiled roof.
Contorted.
Petals (or sepals) twisted in the bud so that they overlap on one side only; spirally twisted