1293 
A. Single-flowered varieties. 
Charles Dickens, single-flowered red. 
1. The upper flowers of the raceme are much smaller than the 
others and have green points at the lobes of the corolla. The pollen 
of these flowers show Nemrc’s phenomenon. The pollengrains in the 
lower flowers of the raceme are normally formed, 21°/, are sterile. 
The pollen of the upper flowers disperse at once in a drop of water; 
of the lower flowers it sticks together. 
2. All flowers contain normal pollengrains, 27°/, of which are 
sterile. The pollen sticks together. 
Général Peélissier, single-flowered red, 16 chromosomes. 
1. The upper flowers of the raceme, are small and green coloured, 
show NeEmec’s phenomenon. The other flowers contain normal pollen, 
14°/, of which is sterile. 
2. Ibid. The stickiness of the pollen is as in Charles Dickens. 
3. The sterility amounts to 6°/,. 
Lady Derby, single-flowered red, 24 chromosomes. 
1. The pollen in all flowers of different racemes gives the same 
impression. The flowerbuds are still quite green and closed. The 
pollengrains do not stick together. Only a few sterile grains are 
present. They at once swell very strongly. In most of the pollen- 
grains many starchgrains are present, which are often very large. 
There occur pollengrains showing Nem«o’s phenomenon. The various 
nuclei are clearly visible. 
2. The pollengrains only swell after a long time; 4°/, are sterile. 
3. The sterility is 34 °/,. 
4. The racemes originate from water-cultures: the sterility is 6°/,. 
5. The pollen is sterile for 4°/,. 
Moreno, single-flowered red. 
1. The anthers are shrivelled and discoloured and contain very 
few pollengrains. These do not swell in water. They have a turbid 
content. Further there are large globe-shaped pollengrains present 
which soon burst. The preparation is then full of loose starchgrains. 
Several normally formed pollengrains show NeMrc's phenomenon. 
In some normal non-swelling pollengrains 2 globe-shaped nuclei of 
equal size are clearly visible. I do not find one normal fertile grain. 
Some starchgrains are as large as a small pollengrain. 
2. The colour of the flower is orange-red. The dark streak that 
runs over the middle of the lobes of the corolla is clearly outlined. 
The sterility is 24°/,. 
3. The colour of the flower is rose-red. The dark streak is dimly 
