Petals 5, differing slightly in size, imbricate, sometimes unguiculate, free, keel without apical appendages.

花瓣5，方面的不同稍，覆瓦状，有时具爪，离，没有顶端属物的脊。

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

花瓣离，与5个雄蕊外产蜜腺的腺体，色或红色，很少白色，通常先端具细齿。