102 
H. H. BARTLETT 
mutation is so densely pubescent that it looks gray in comparison with 
the green foliage of the type. 
Among the five primary mutations and 44 Fi plants of mut. lasio- 
petala which have been under observation only one plant has so far 
flowered. All of the few plants which became cauline formed rosettes 
at the ends of the stem and branches instead of flowering. Only in 
the case of the plant shown in figure i, a single branch flowered late 
Fig. I. The original plant of Oe. stenomeres mut. lasiopetala, no. 32-4-6-15. 
The label on the ground is 10 cm. long. 
in the fall of 191 3 and produced three capsules of seeds. All of the 
other branches, and the main stem, bore rosettes in every way like the 
radical rosette. In 1914 no seeds were obtained. The most striking 
feature of mut. lasiopetala, the hairiness of the petals, has therefore 
been observed in only one plant. The pollen was examined and was 
found to have three germination points, as in the parent form. Perhaps 
one grain in a hundred was found to have four points, as in mut. gigas. 
In f. typica 60 to 80 per cent of the pollen grains are perfect; in mut. 
