Photo: Rhinanthus serotinus.

Flowers. A half-parasite, it only flowers when it can take strength from a host. BGBM, Berlin, Germany. Wild. 1995-06-01.
Rhinanthus serotinus (Schonh.) Oborny Engl.: greater yellow-rattle, late-flowering yellowrattle. Deu.: Grosser Klappertopf. Suom.: isolaukku. Sven.: höskallra, höstskallra, stor höskallra. Bot. syn.: Rhinanthus angustifolius C. C. Gmel., Rhinanthus major auct.
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Photo: Rhinanthus serotinus.