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Northern Ontario Plant DatabaseSynonymySynonymy - Spiraea x Rosaceae Rose Family Spiraea ×arguta Zabel (S. multiflora × S. thunbergii) Spiraea ×billiardii Herincq., pro sp. (S. douglasii × S. salicifolia)
Spiraea ×cinerea Zabel Spiraea ×pyramidata Greene, pro sp.
Spiraea ×vanhouttei (Briot) Zabel 1884, non Carrière 1876, pro.sp. , nom. illeg. (S. cantoniensis x S. trilobata)
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