FIGURE 1. Fossil water lily flower from the Early Cretaceous (Barremian or Aptian) of Portugal, a–c, SEM micrographs of specimen S122015, Vale de Agua sample 328.
From the following article:
Fossil evidence of water lilies (Nymphaeales) in the Early Cretaceous
Else Marie Friis, Kaj Raunsgaard Pedersen and Peter R. Crane
Nature 410, 357-360(15 March 2001)
doi:10.1038/35066557
a, Lateral view of fossil showing the perigynous nature of the flower; magnification, 
18. b, Apical view of flower showing carpels radiating from the central protrusion of the floral apex, and remnants from stamens (rhombic) and perianth (narrow elliptical); magnification, 20. c, Pollen grain showing monocolpate aperture and reticulum of pollen wall; magnification, 2,000. d, Reconstruction of the fossil flower.
