Carex williamsii SynonymySource: Jiménez-Mejías, P. & Luceño, M. (2011+): Cyperaceae. – In: Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity.Carex williamsii Britton in Bull. New York Bot. Gard. 51: 159. 1901ContentDistribution Bibliography Distribution Rf(N) Euro+Med not endemicA: Russia (N European Russia nativeA,B) Bibliography A. Egorova, T.V. 1999 The sedges (Carex L.) of Russia and Adjacent States. Missouri Botanical Garden 772 pp B. Tolmatchew, A. I. 1966: Flora arctica URSS 3. – Moskva & Leningrad