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

花5，尺寸方面的不同稍，覆瓦状，有时具爪，离生，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.

花离生，与5个雄蕊外产蜜腺的腺体互生，红，很少白，通常先端具细齿。