divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members
pentamerous详细解释
pen.tam.er.ous
adj.(形容词) Having five similar parts. 有五个相似部分的 Having flower parts, such as petals, sepals, and stamens, in sets of five, as in the geranium. 五个一组的花的组成部分:花朵中的组成部分,如花瓣、萼片和雄蕊成五个一组排列的,如在天竺葵中