Silene nutans, 1 of 17

Nottingham Catchfly

Caryophyllaceae
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Silene nutans
Cultivated plants

Apparently this species is not dioecious exactly but certainly seems that way on first encounter. Sources vary on the exact behaviour. Some say it is gynodioecious and others that it changes from night to night ! (See the Wikipedia entry.)
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British Isles status: native
Scarce
Perennial
  Photo: J R Crellin