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

花瓣5，在尺寸方面稍，覆瓦状，有时具爪，离生，没有顶端属物脊。

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

花瓣离生，与5个雄蕊外产体互生，黄色或红黄色，很少白色，通常在先端具细齿。