Annals 
of the 
Missouri Botanical Garden 
Vor. 4 FEBRUARY, 1917 No. 1 
HYBRID NYMPHAEAS 
GEORGE H. PRING 
In Charge of Conservatories, Missouri Botanical Garden 
During the last four years the collection of nymphaeas at 
the Garden has been greatly augmented and the area for 
carrying on experiments considerably increased. This has 
offered the writer greater opportunities for intercrossing and 
also for growing a larger number of fully developed plants 
during the summer months. Up to the present time it has 
been impossible to determine the law of heredity in the re- 
sults obtained, but some interesting factors have appeared 
in the hybrids of Nymphaea flavo-virens Lehm., a species of 
Mexico, and Nymphaea capensis var. zanzibariensis (Casp.) 
Conard, native of Africa. 
In 1912 N. flavo-virens 2 was crossed with the blue-flowered 
form of N. capensis var. zanzibariensis 3, and also with the 
light pink form, namely, N. capensis var. zanzibariensis f. 
roseaé. The hybrids from both crosses have been in the 
trade for several years, the former known as Nymphaea 
** William Stone"! and the latter as ** Mrs. С. W. Ward." Both 
are given as sterile by Dr. Н. S. Conard in his ‘Monograph of 
the Genus Nymphaea,' but those raised at the Garden pro- 
duced at least 25 per cent of fertile seed, this factor allow- 
ing the work to be carried further. 
Both varieties were subsequently self-pollinated. ‘‘Mrs. 
C. W. Ward," in the second generation, produced light pink, 
dark pink, and blue flowers, the light pink being identieal with 
ANN. Mo. Вот. GARD., VOL. 4, 1917 (1) 
