Hybridises with other Willowherbs, namely :

• New Zealand Willowherb (Epilobium brunnescens) to produce Epilobium ×chateri
• Alpine Willowherb (Epilobium anagallidifolium) to produce Epilobium × dasycarpum
• Chickweed Willowherb (Epilobium alsinifolium) to produce Epilobium × haynaldianum
• Pale Willowherb (Epilobium roseum) to produce Epilobium × purpureum
• Great Willowherb (Epilobium hirsutum) to produce Epilobium × waterfallii
• Short-fruited Willowherb (Epilobium obscurum) to produce Epilobium × schmidtianum

Lookee-Likees : Many other Willowherbs!

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