1.Utricles convex abaxially, plane or slightly concave adaxially; rostra 1/8-1/5 length of kernel; seed adherent to pericarp; leaves and bracts acute but not acicular at apex.
胞凸背面,正面平面或者稍凹;喙1/8-1/5段珠心;种子附着;叶和苞片锐尖但不是针状在先端。
2.Utricles convex on both sides; rostra nearly equal to length of kernel; seed free from pericarp; leaves and bracts acicular to spinulose at apex.