Thyrses 5 - 7 cm in diameter , sparsely flowered , with 2 - 5 white sterile marginal flowers about 2 - 3 cm in diam . ; peduncles 2 - 4 cm long ; fertile flowers yellowish white , corolla c . 3 mm in diam . , rotate , lobes ovate , half as long as corolla tubes ; stamens nearly as long as corolla , anthers oblong ; styles slightly higher than calyx teeth 聚傘花序直徑5 - 7厘米,花稀疏,外圍有2 - 5朵白色、直徑2 - 3厘米的不孕花,總花梗長2 - 4厘米;可孕花花冠黃白色,直徑約3毫米,輻狀,裂片卵形,長約為筒之半;雄蕊與花冠幾等長,花藥矩圓形;柱頭略高出萼齒。