Female flowers: perianth lobes 4, unequal, outer (dorsal-ventral) 2 larger, keeled, corniculate below apex, inner 2 smaller, flat, all usually with stinging hairs below apex.

• 雌花：花被裂片4，不相等，外部(背部腹)大的2，翻转，在顶下面具小角状突起，柱头近无柄，具毛撮头状。