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CARNEGIE INSTITUTION OF WASHINGTON. 



WATERLILIES, PLATE 18. 



NYMPH/EA RUBRA. 

 1-4, Vertical sections of flowers in different phases of inflorescence. 5, Sepals. 6-7 Petals. 8-10, Outer median and inner stamens 

 from front and back. 11, 12, IS, 16. 17, 18, 19, 20, aspects of mature pollen. 13, 14, 21, phases of germination of pollen. 22, Trans- 

 verse section of style. 23-2fi, Hairs on ovary. 27, Stigma spread out and seen from above. 28, Ovary and carpellary styles seen from 

 the side. 29, Ovarv and stamens. 





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