Fig. 1: Flowers and their pseudonectary-bearing petals in representative species of the Ranunculaceae.

a Eranthis stellata. b Trollius buddae. c Nigella arvensis ssp. arvensis. d N. damascena. Red arrows point to the pseudonectaries. Scale bars at the right side of flowers: 1 cm; scale bars at the right side of petals: 1 mm.