Styles short;stigmas capitate.Utricles irregularly circumscissile (bursting).

花柱短柱头头状不规则胞周裂(爆发)。

Utricles convex on both sides; rostra nearly equal to length of kernel; seed free from pericarp; leaves and bracts acicular to spinulose at apex.

胞凸两面；喙差不多等于珠心长度；种子离生；在先端针状叶和苞片。