Petals induplicate or valvate , oblong or ovate-oblong , rarely obovate .

镊合状的花瓣内向镊合的或，长圆形或卵形长圆形，很少倒卵形。

Corolla lobe margin usually narrowly involute , valvate or induplicate .

花冠裂片边缘通常狭内卷，镊合状或。