Perea D, García A, Carrasco de Salazar MA. Types of species described by M.P. Graells (1809-1898) found in the Real Colegio Alfonso XII (San Lorenzo del Escorial, Madrid). Bot. complut. 1996;21:87. Accedido julio 15, 2026. https://revistas.ucm.es/index.php/BOCM/article/view/BOCM9696110087A