Carex crawfordii Fernald (N-Am.) – A very rare, locally naturalised alien, discovered in 1976 (Duvigneaud & Schumacker 1977) by the Bütgenbach lake near Rocherath and Bütgenbach (nord-eastern and southern parts of the lake) but likely to be present elsewhere in the same area. Possibly little known and locally confused with native Carex ovalis (see for instance Corporaal & al. 2004). Thought to have been introduced by the end of World War II by American troops. In 2010 furthermore discovered in nature reserve Fluithoekduinen in Koksijde (a single specimen; relatively close to a stand with Juncus dudleyi) and in nature reserve Groot Schietveld near Wuustwezel (locally very common in exposed fens in a training area for military vehicles).
In Bütgenbach Carex crawfordii is still persisting but possibly threatened, especially in the southern parts of the lake (Saintenoy-Simon 1996). However, in its northern parts Carex crawfordii is still proliferating (Saintenoy-Simon 1997). It seems well-established and apparently hitherto overlooked in the Groot Schietveld area.
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| Carex crawfordii |
Carex ovalis |
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| Carex crawfordii | Carex ovalis |
Selected literature
µBizot A. & Parent G.H. (2005) Trois plantes américaines du Nord-Est de la France: 1. Carex vulpinoidea Michx., 2. Glyceria striata (Lam.) Hitchcock, 3. Scirpus atrovirens Willd. Bull. Soc. Hist. Nat. Ard. 94: 24-34.
Corporaal A., Wijkel A.-M. & Jansen J. (2004) Carex crawfordii Fernald in Noord-Brabant. Gorteria 30: 73-74.
Den Held H. & Kortselius J. (1964) Carex crawfordii Fern. weer in Nederland. Gorteria 2: 21-22.
Depasse S. (1993) Carex crawfordii Fernald en Alsace. Monde Pl. 448: 11-12.
Duvigneaud J. & Schumacker R. (1977) Une cypéracée nouvelle pour la flore belge: Carex crawfordii Fern. Bull. Soc. Roy. Bot. Belg. 110: 42-48.
Galunder R. & Patzke E. (1988) Carex crawfordii Fernald (Falsche Hasenfuss-Segge) eine für Mitteleuropa bislang unbekannte Art. Flor. Rundbr. 21: 77-79.
Galunder R. & Patzke E. (1989) Über die Verbreitung von Eleocharis austriaca Hayek und Eleocharis mammilata Lindb. f. im Bergischen Land und in den Randgebieten. Flor. Rundbr. 23(1): 1-5.
Kooman J. (2015) Allochtone Zeggen (Carex-soorten) in Nederland. Gorteria 37: 73-83.
Lecron J.-M. (2015) Carex crawfordii Fernald (Cypéracée) découvert en Argonne, une nouvelle laîche pour le département des Ardennes (France). Bull. Soc. Hist. nat. Ard. 104: 46-53.
Repka R., Lustyk P. & Trávnícek B. (1997) Carex scoparia – a new alien sedge in Europe. Preslia 69: 161-168.
Saintenoy-Simon J. (ed.) (1996) Trouvailles floristiques récentes en Wallonie, dans le Grand-Duché de Luxembourg et dans le nord de la France. Adoxa 13-14: 1-52.
Saintenoy-Simon J. (1997) Excursion dans la région de Waimes et de Bütgenbach, le 14 septembre 1996. Adoxa 17: 19-21.
Wallnöfer B. (1993) Carex bebbii und Carex vulpinoidea, zwei eingeschleppte Arten aus Nordamerika, sowie 8 weitere Gefässpflanzen Nordtirols (Österreich). Linzer biol. Beitr. 25: 397-409.