Spiraea × macrothyrsa
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Spiraea × billardii
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Spiraea × billardii

Accepted name:Spiraea × billardii Dippel

Discussion

Сергей Майоров
Spiraea × macrothyrsa Dippel = S. douglasii Hook. × S. latifolia (Sol.) Borkh. Поскольку S. latifolia – синоним S. alba Du Roi (это не признают разве что в Отечестве), то S. × macrothyrsa синоним S. × billardii Herincq. О гибридах этой группы подробнее всего написано здесь: http://archive.bsbi.org.uk/Wats18p147.pdf
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