io6 
ANNE M. LUTZ 
No. 5414 produced no pollen whatever. A somatic metaphase group 
from this plant (Figs. 9a, ()b) is shown in Fig. 8c. 
Fig. 9. a, plant No. 5414 (see 8 c) in greenhouse rosette stage, b, same plant 
in late garden rosette stage. About 1.5 dm. in diameter; growth completed. 
Note its abnormal appearance. 
3. Origin of the i6-chromosome Condition in Offspring of 14- and 15- 
chromosome Forms. 
As has been pointed out on preceding pages of this report, the 16- 
chromosome condition in the three mutants may have arisen through 
9 + 7 or 8 +8 unions; it is difficult to state which is the more probable 
in either case. If the plant produced by 0. lata was the product of the 
first combination, it is probable that it resulted from a 9 9 + 7, 
rather than a 9 7 + cf 9, union. 
The 1908 and 1910 Lamarckiana mutants were far more suggestive 
of 0. lata than the 1910 offspring of selfed lata. The latter could not 
be designated as a lata-Yike plant. It might be suggested that the 
two former may each have arisen from the union of two 8-chromosome 
gametes bearing lata characters and the latter from a 9 9 + cf 7 
union, but we should then be required to explain why the Lamarckiana 
mutants did not have duplicate vegetative characters. 
The 1908 plant was grown during the first season in which the 
writer studied the vegetative characters of various plants of the 
Lamarckiana group with particular care, hence minor differences 
between No. 5343 and ordinary lata may have been overlooked. The 
records refer merely to the distinguishing characters of the leaf, 
