Perea, D., García, A., & Carrasco de Salazar, M. A. (1996). ~pes of species described by M. P. Craells (1869-1898), found ‘u the Real Colegio Alfonso XII (San Lorenzo del Escorial, Madrid). Botanica Complutensis, 21, 87. https://revistas.ucm.es/index.php/BOCM/article/view/BOCM9696110087A