Spiraea opulifolia var. nana G.Kirchn. variety synonym

Spiraea opulifolia var. glabra Hook. variety homotypic synonym

Physocarpus riparius var. parviflora Raf. variety synonym

Physocarpus riparius var. arborea Raf. variety synonym

Spiraea opulifolia subsp. pauciflora Nutt. subspecies synonym

Physocarpus amurensis var. concolor Kom. variety homotypic synonym

Physocarpus opulifolius var. tomentellus (Ser.) Hegi & Gams variety synonym

Neillia monogyna (Torr.) Greene species proparte synonym

Neillia amurensis (Maxim.) G.Nicholson species synonym

Physocarpus opulifolius var. capitatus (Pursh) Dippel, 1893 variety synonym

Spiraea pauciflora Nutt. ex Torr. & A.Gray species synonym

Physocarpus riparius Raf. species synonym

Physocarpus opulifolius var. nana G.Kirchn. variety synonym

Physocarpus glaber Raf. species synonym

Opulaster opulifolius var. typicus C.K.Schneid., 1904 variety synonym

Opulaster opulifolius var. nanus C.K.Schneid. variety synonym

Physocarpus ribesifolius Kom. species synonym

Opulaster ribesifolius Kom. species synonym

Physocarpus malvaceus (Greene) Kuntze species accepted

Opulaster pauciflorus (Nutt.) A.Heller species synonym

Neillia torreyi Hook.fil. species synonym

Physocarpus pauciflorus (Torr. & A.Gray) Piper species synonym

Neillia malvacea Greene species synonym

Neillia monogyna var. malvacea (Greene) M.E.Jones variety synonym

Opulaster pubescens Rydb. species synonym

Opulaster malvaceus (Greene) Kuntze species synonym

Physocarpus alternans (M.E.Jones) J.T.Howell species accepted

Physocarpus alternans subsp. typicus J.T.Howell subspecies synonym

Physocarpus australis (Rydb.) Rehder species synonym

Physocarpus torreyi (S.Watson) Maxim. species synonym

Physocarpus monogynus (Torr.) J.M.Coult. species accepted

Physocarpus pubescens A.Nelson species synonym

Physocarpus intermedius (Rydb.) C.K.Schneid. species accepted

Physocarpus intermedius f. parvifolius Rehder form synonym

Physocarpus opulifolius (L.) Maxim. species accepted

Spiraea opulifolia L. species heterotypic synonym

Opulaster australis Rydb. species synonym

Opulaster opulifolius (L.) Kuntze species synonym

Opulaster stellatus Rydb. species synonym

Opulaster alabamensis Rydb. species synonym

Physocarpus opulifolius f. atropurpureus Geerinck form synonym

Physocarpus opulifolius var. intermedius (Rydb.) B.L.Rob. variety synonym

Opulaster opulifolius var. intermedius (Rydb.) Farw. variety synonym

Opulaster intermedius Small species heterotypic synonym

Physocarpus missouriensis Daniels species synonym

Opulaster ramaleyi A.Nelson species synonym

Neillia intermedia (Rydb.) Bean species synonym

Physocarpus stellatus (Rydb. ex Small) Rehder species synonym

Neillia stellata (Rydb. ex Small) Bean species synonym

Physocarpus ferrugineus (Nutt.) Daniels species synonym

Spiraea opulifolia var. ferruginea Nutt. ex Torr. & A.Gray variety synonym

Neillia opulifolia var. ferruginea (Nutt.) S.Watson variety synonym

Physocarpus ramaleyi A.Nelson species synonym

Physocarpus amurensis (Maxim.) Maxim. species accepted

Physocarpus amurensis var. concolor Kom. ex Pojark. variety synonym

Spiraea amurensis Maxim. species synonym

Opulaster amurensis (Maxim.) Kuntze species synonym

Physocarpus bracteatus (Rydb.) Rehder species synonym

Opulaster bracteatus Rydb. species synonym

Neillia bracteata (Rydb.) Bean species synonym

Physocarpus capitatus (Pursh) Kuntze species accepted

Opulaster opulifolius var. capitatus (Pursh) Jeps. variety synonym

Spiraea opulifolia var. tomentosa Hook. ex Raf. variety synonym

Physocarpus tomentosus Raf. species synonym

Spiraea capitata Pursh species synonym

Spiraea opulifolia var. multiflora Durand variety synonym

Spiraea opulifolia var. tomentella Ser. variety synonym

Opulaster opulifolius var. tomentellus C.K.Schneid. variety synonym

Neillia capitata (Pursh) Greene species synonym

Spiraea opulifolia var. mollis Torr. & A.Gray variety synonym

Spiraea ribifolia Nutt. ex Torr. & A.Gray species synonym

Opulaster capitatus (Pursh) Kuntze species synonym

Neillia opulifolia var. mollis (Torr. & A.Gray) W.H.Brewer & S.Watson variety synonym

Icotorus montanus Raf. species synonym

Opulaster monogynus (Torr.) Kuntze species synonym

Spiraea opulifolia var. parvifolia A.Gray ex Porter & J.M.Coult. variety synonym

Physocarpus glabratus (Rydb.) Rehder species synonym

Neillia glabrata (Rydb.) Bean species synonym

Opulaster glabratus Rydb. species synonym

Opulaster bullatus Medik. species synonym

Neillia opulifolia (L.) W.H.Brewer & S.Watson species synonym

Physocarpus glabra Raf. species synonym

Spiraea caroliniana Marshall species synonym

Epicostorus montanus (Raf.) Raf. species synonym

Spiraea monogyna Torr. species synonym

Spiraea opulifolia var. pauciflora Torr. & A.Gray variety synonym

Physocarpus opulifolius f. nanus (G.Kirchn.) Zabel form synonym

Physocarpus opulifolius var. opulifolius variety synonym

Opulaster malvaceus (Greene) Greene species synonym

Opulaster monogynus (Torr.) Greene species synonym

Neillia opulifolia (L.) Benth. & Hook.f. species heterotypic synonym

Physocarpus opulifolius Raf. species synonym

Physocarpus ribesifolius Kom. ex Nakai species synonym

Physocarpus intermedius Daniels species synonym

Physocarpus monogynus (Torr.) A.Nelson species synonym

Physocarpus monogynus (Torr.) Kuntze species synonym

Spiraea opulifolia var. lutea G.Kirchn. variety synonym

Spiraea opulifolia var. glabra Hook. ex Merr. variety synonym

Physocarpus opulifolius var. luteus (G.Kirchn.) Dippel variety synonym

Opulaster opulifolius f. luteus C.K.Schneid. form synonym

Opulaster intermedius Rydb. species heterotypic synonym

Opulaster capitatus (Pursh) Greene species synonym

Physocarpus torreyi J.M.Coult. species synonym

Opulaster stellatus Rydb. ex Small species synonym

Spiraea opulifolia var. ferruginea Nutt. variety synonym

Physocarpus opulifolius f. luteus (G.Kirchn.) Zabel form synonym

Physocarpus malvaceus (Greene) A.Nelson species synonym

Physocarpus opulifolius J.M.Coult. species doubtful

Physocarpus microlobatus Baik. species doubtful

Physocarpa torreyi Maxim. species synonym

Physocarpus opulifolius var. nanus Zabel variety synonym

Physocarpus opulifolius var. aureus Rehder variety synonym

Physocarpus pauciflorus C.K.Schneid. species doubtful

Physocarpus pauciflorus (Nutt.) Zabel species synonym

Spiraea pauciflora Nutt. species homotypic synonym

Spiraea opulifolia Pall. species synonym

Physocarpus opulifolius Maxim. ex Koehne species synonym

Neillia torreyi S.Watson species heterotypic synonym

Spiraea ribifolia Nutt. species synonym

Physocarpus opulifolius var. tomentellus (Ser. ex DC.) B.Boivin variety synonym

Spiraea opulifolia var. parvifolia A.Gray variety homotypic synonym

Spiraea opulifolia var. tomentosa Hook. variety homotypic synonym