1.Petals 3-5, short, concave, quincuncial or imbricate in bud, distinct or rarely basally connate and adnate to staminal tube.
花瓣3-5,短,凹,在芽中覆瓦状或梅花形,离生或很少基部与雄蕊管合生和贴生。
2.Calyx 5- or rarely 4-partite, quincuncial, basal glands usually present.
花萼5或者很少4分裂,通常基部腺体宿存,梅花形,基部通常有腺体。
3.Petals 5, yellow, ovate, ca. 2. 5 mm, quincuncial, free from staminal tube, glabrous.
花瓣5,黄色,卵形,长约2.5毫米,梅花形,雄蕊管离生,无毛。