224 



The Waterliues. 



Without going farther into isolated details, enough has been said to 

 show that a wide and interesting field lies open to the student in 

 crossing and inverse crossing of waterlilies. It is unfortunate that Cas- 

 pary's extensive investigations in this line have not been formulated, but 

 his notes, exquisite color sketches, and large collection of pressed speci- 

 mens are preserved in the Royal Herbarium of Berlin. Among them are 

 such crosses as N. capensis X caerulea ; N. capensis X (capensis X caerulea) ; 

 N. caerulea x [caerulea X {capensis X caerulea)] ; N. caerulea X \ caerulea X 

 [caerulea x (capensis X caerulea) - ] \ ; N. flavo-virens X [capensis X (caerulea X 

 micrantha)] . 



Fio. 77. Numphaea pulcherrima Tricker. Sepal, three successive petals; three 

 successive stamens, vertical section of ovary. Two-thirds natural size. 



Duplicate specimens of many of these hybrids were distributed to 

 several other herbaria. Time did not permit us to make a study of these. 

 We hope they will be worked over by some scholar, and the interesting 

 results made known. We have, for the convenience of students and culti- 

 vators, brought together, in the following pages, some account of the hybrids 

 and garden varieties that have come more directly under our notice. 



