Reference

C. Ruiz Rejon, M. Cueto, R. Lozano, M. Ruiz Rejón (1990): Asphodelus tenuifolius and A. fistulosus (Liliaceae) are morphologically, genetically, and biologically different species – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 169: 1 - 12.