Sect. Polystachyae Tuckerm. (Cyperaceae)
组4. 多穗薹草组 Sect. 4. Polystachyae Tuckerm.
名称文献：Sect. 4. Polystachyae Tuckerm., Enum. Meth. 10, 1843; Kukenth. in Bot. Jahrb. 27: 517, 1899, quoad basion et in Engl., Pflanzenr. Heft 38 (IV. 20): 257. 1909, p. p. Max.; Ohwi in Mem. Coll. Sci. Kyoto Imp. Univ. ser. B. 11: 462, 1936; Nelmes in Reinwardtia 1: 322, 1915 et in Mem. Mus. Nat. Hist. Nlle ser. B. Bot. 4 (2): 134, 1955; Raymond in Mem. Jard. Bot. Montrealno 53: 49, 1959 et in Dansk. Bot. Ark. 23: 257, 1965, p. p. max. Kern et Noot. in Steenis, Fl. Males. ser. 1. 9 (1): 136, 1979, p. p. Max. ——Sect. Acrarrhenae Fries Sippe Longebracteatae Pax in Engler u Prantl. Pflanzenfam. 2, 2: 124, 1887. ——Sect. Polystacheae C. B. Clarke Ser. Longispicae C. B. Clarke in Journ. Linn. Soc. Bot 37: 4, 1904, p. p.
形态特征：简单或复出圆锥花序，小穗多数，两性，雄雌顺序，全部从内无花的囊状枝先出叶中生出，圆柱形，长2-8厘米；果囊不肿胀，纸质或膜质，具少数细脉。
形态特征：组模式种：鼠尾薹草Carex myosurus Nees。
产地分布：本组我国有3种。