For Philadelphus
Hu, S.-Y. 1954-1956. A monograph of the genus Philadelphus. J. Arnold Arb. 35: 276-333; 36: 52-109; 37: 15-90. Google Scholar
Hufford. 2004. In Kubitzki, K., ed. 2004. The families and genera of vascular plants. VI. Flowering plants – Dicotyledons – Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin. 489 pp. Google Scholar
Weakley, A.E. 2002. Evolutionary relationships within the genus Philadelphus L. (Hydrangeaceae). Master's thesis, Biology Dept., Univ. of North Carolina, Chapel Hill, NC. Google Scholar
Weakley, A.S., and J. Henrickson. 2016. Philadelpus. In Flora of North America Editorial Committee. 2016. Flora of North America north of Mexico. Volume 12, Magnoliophyta: Vitaceae to Garryaceae. Oxford Univ. Press, New York, NY. 603 pp. Google Scholar