亞屬概述
薹草亞屬 Subgen. 2. Carex——Eucarex Coss. et Germ. Fl
Subgen. 2. Carex——Eucarex Coss. et Germ. Fl, Paris 744, 1845; Kukenth, in Engl., Bot. Jahrb. 27: 519, 1899 et in Engl., Pflanzenr. Heft 38(IV, 20): 293, 1909; V. Krecz. in Kom., Fl. USSR 3: 201, 1935, Ohwi, Cyper. Japon. 1: 273, 1936.
多年生草本,根狀莖具地下匍匐莖或無。花單性,雌雄同株;小穗1個至多數,單性或單性與兩性兼有,罕全為兩性,兩性者雄雌順序或雌雄順序,單個頂生或單個、多個生於苞片腋內,少數種類排列成復花序;枝先出葉鞘狀,內無花。果囊三棱形、平凸狀或雙凸狀。小堅果三棱形,平凸狀或雙凸狀;花柱稍細長,花柱基部增粗或不增粗;柱頭3個,少數2個。
本亞屬有43組。
下級分類
白鱗薹草組Sect. Albae Aschers. et Graebner.
異囊薹草組Sect. Anomalae Carey
細稈薹草組Sect. Capillares Aschers. et Graebn.
頭穗薹草組Sect. Capituligerae Kukenth
密花薹草組Sect. Confertiflorae Franch.
隱穗薹草組Sect. Cryptostachyae Franch.
美穗薹草組Sect. Decorae (Kukenth.) Ohwi
指狀薹草組Sect. Digitatae Fries
異株薹草組Sect. Dioicae (Tuckerm.) Pax
溪水薹草組Sect. Forficulae Franch. ex Raymond
凍原薹草組Sect. Frigidae Fries ex Kukenth.
米柱薹草組Sect. Glaucaeformes Ohwi
細柄薹草組Sect. Gracilis Tuckerm.
短喙薹草組Sect. Grallatoriae Kukenth.
膜囊薹草組Sect. Hymenochlaenae Drejer
匏囊薹草組Sect. Lageniformes (Ohwi) Nelmes
黃囊薹草組Sect. Lamprochlaenae Drejer
疏花薹草組Sect. Laxiflorae Kunth
濕生薹草組Sect. Limosae Tuckerm.
灰帽薹草組Sect. Mitratae Kukenth.
柔果薹草組Sect. Molliculae Ohwi
玉簪薹草組Sect. Montanae Fries
硬毛果薹草組Sect. Occlusae C. B. Clarke
尖苞薹草組Sect. Orthocerates Koch
沼生薹草組Sect. Paludosae Fries
少花薹草組Sect. Paniceae Tuckerm.
脹囊薹草組Sect. Physocarpae Drejer
帚狀薹草組Sect. Praelongae (Kukenth.) Nelmes
似莎薹草組Sect. Pseudo-cypereae Tuckerm.
根穗薹草組Sect. Radicales (Kukenth.) Nelmes
單穗薹草組Sect. Rarae C. B. Clarke
根足薹草組Sect. Rhizopodae Ohwi
菱形果薹草組Sect. Rhomboidales Kukenth.
石薹草組Sect. Rupestres Tuckerm.
離穗薹草組Sect. Secalinae O. F. Lang
寬葉薹草組Sect. Siderostictae Franch.
隱果薹草組Sect. Temneris (Rafin.) V. Krecz.
糙果薹草組Sect. Trachychlaenae Drejer
圖們薹草組Sect. Tuminenses Y. L. Chang et Y. L. Yang