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Pterygiella nigrescens
Pterygiella nigrescens Oliver [Accepted]
Scrophulariaceae Orobanchoideae Rhinantheae
2 852841 Pterygiella nigrescens Oliver
W.J. Hooker, J.D. Hooker, Icon. Pl., vol. 25 : t. 2463 (1896) [M. Smith]