Nutlets with adaxial bottom surfaces and abaxial ones usually arcuate-convex, adaxial bottom surface smaller, 2 lateral surfaces equal in size; inflorescences bracteate at least basally.

• 小坚果与通常弧曲凸的正面底部表面和背轴一起，小的正面底部表面，2侧面大小相等；具苞片的花序至少基部。(24