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

花柱短柱头头状不规则胞果周(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.

胞果凸两面；喙差不多等于珠心长度；种子离生果皮；具微刺在先端针状叶和苞片。