Task: Sentence Expansion
Input (English): An epicalyx , an additional whorl around the calyx of a single flower , is a modification of bracteoles .
Output (English): An epicalyx , which forms an additional whorl around the calyx of a single flower , is a modification of bracteoles In other words , the epicalyx is a " group of bracts resembling a calyx " or " bracteoles forming a whorl outer to the calyx " .