From PyroGuideEdit

Shell with a pistilIf a shell has a cluster of stars inside the main petal which are not arranged in a particular pattern then it is said to have a pistil. Pistils can be made either by placing a cluster of stars at the center of the shell, by mixing them in with the bursting charge, or sometimes even by coating the stars with the bursting charge where the stars act much in the same way that other materials such as rice hulls or vermiculite but with an added effect. Common sense would suggest that the latter method will only be effective if the pistil stars are very small. A Pistil is different from an inner petal in that in a petal the stars are arranged in a pattern, most commonly a sphere.

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