Corolla 5- or rarely 4-lobed, salverform, funnelform, urceolate, or rarely rotate, lobes overlapping to right or left, rarely valvate.

• 花冠5或者很少4裂，高脚碟状、漏斗状，瓶形，或者很少旋转状，裂片向右或者向左重叠，很少镊合状排列。