雄蕊的

Stamens 4, didynamous, inserted at middle of corolla tube, slightly exserted.

蕊4，花冠筒，稍外露的二强蕊，着生的在中部。

Petals free, alternating with 5 extrastaminal nectary glands, yellow to reddish yellow, rarely white, often denticulate at apex.

花瓣离生，5蕊外产蜜腺的腺体互生，黄色或黄色，很少白色，通常在先端具细。