Reference

T. W. Yang, J. H. Hunziker, L. Poggio, C. A. Naranjo (1976/1977): Hybridization Between South American Jarilla and North American Diploid Creosotebush (Larrea, Zygophyllaceae) – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 126: 331 - 346.