Sect. Lageniformes (Ohwi) Nelmes (Cyperaceae)
组18. 匏囊薹草组
名称文献：Sect. 18. Lageniformes (Ohwi) Nelmes in Reinwartia 1: 366, 1951; Raymond in Mem. Jard. Bot. Montreal 53: 63, 1959; Kern et Nooteboomin van Steenis, Fl. Males. ser. I, 9 (1): 148, 1979. ——Sect. Praecoces Christsubsect. Lageniformes Ohwi, Cyper. Japon. I: 340, 1936; T. Koyama in Journ. Fac, Sci. Univ. Tokyo Sect. III, 8 (4): 167, 1962, pro parte ——Sect. Mitrataesubsect. Eumitratae Kkenth. in Engl., Pflanzenr. Heft 38 (IV, 20): 461, 1909, p. p.
形态特征：根状茎短或斜生。秆中生或侧生，柔弱或纤细，似花葶状。叶长于秆。苞片短叶状或叶状，具鞘。小穗3-6或更多，顶生小穗雄性，侧生的雌性。雌花鳞片长圆状卵形或宽倒卵形。果囊纺缍形或菱状纺缍形。小坚果菱形或纺缍形，上部具一个显著圆柱状的颈，顶面平截或稍凹陷，三个棱面中部凸出成腰状，上下凹入。花柱基部稍膨大而宿存。