Calyx tubular, campanulate, or cup-shaped, apex truncate to deeply lobed, sometimes with abaxial glands, leathery, falling with petals and stamens.

• 花萼管状，钟状，或杯状的，先端截形对深裂，有时背面的具腺体，革质的，与花瓣和雄蕊一同脱落。