Calyx lobes with white or yellowish, circular or semicircular pulvinate area at base; tube with robust dilated zone at middle inner surface without ridges, orifice ring absent.

• 萼裂片具白色的或淡黄，圆形或半圆的垫状区在基部；筒部具粗壮膨大带在中部内表面没有脊，孔环无。(31