Dunn No year - Decades Kewenses: Plantarum Novarum in Herbario Horti Regii Conservatarum. Decas CIV (1921) Decades Kewenses: Plantarum Novarum in Herbario Horti Regii Conservatarum. Decas CIV. Bulletin of Miscellaneous Information (Royal Gardens, Kew) 1921(8): 307. doi: 10.2307/4113556.
There is no corrections for Spiraea diversifolia yet.