Catapodium rigidum (L.) C.E.Hubb. [ Festuca rigida (L.) Raspail]
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Catapodium rigidum (L.) C.E.Hubb. [ Poa rigida L.] [Gramineae]
J. Sturm, E.H.L. Krause, K.G. Lutz, Deutschl. Fl., ed. 2, vol. 3 : t. 41, fig. 1 (1900)