70 
ANNE M. LUTZ 
Scarcely a day but one or two cleft-petaled flowers were found on each 
plant, and usually many more. On a certain day, 22 of the 45 flowers 
produced by one of these mutants had cleft petals. The records for 
the 9 mutants employed for 4+-rayed stigma counts (see page 66) 
on the day previously mentioned, August 31, will serve as a typical 
illustration: 74 of the 214 flowers produced, almost 35 percent, had 
cleft petals. 
The pollen of 0. hipartita consists of 3-lobed grains. In the buds 
of the mutants observed it was found to be entirely absent, produced in 
small quantities, or present in moderate amounts ; these conditions were 
found in the various buds of each plant. A large percentage of the 
grains produced are bad, and it is exceedingly difficult to obtain seeds 
from these forms, selfed. 
Type 5509, presumably a modified form of de Vries's oblonga, 
seems to bear about the same relation to the Amsterdam mutant as 
type 3514 (see Lutz, 'i6b) bears to de Vries's rubrinervis; yet it is 
possible that the two are identical forms. 
(b) A Related Type, Having 15 Chromosomes. — Type 2806, a form 
having many points in common with type 5509. Also found in 
cultures of 0. Lamarckiana. 
(c) Distinct Types Having J5(?) Chromosomes. — These are (i) a 
plant from de Vries's 191 2 culture of 0. lata X 0. Lamarckiana, said 
A 
B 
Number with 
Number with 
Total Num- 
Number with 
Irregular Petal 
Total Num- 
Number with 
Irregular Petal 
ber of 
Irregular Petal 
Arrangement 
ber of 
Irregular Petal 
Arrangement 
Flowers 
Arrangement 
and Cleft 
Flowers 
Arrangement 
and Cleft 
Petals 
Petals 
June 28 
30 
13 
8 
" 29. .... 
54 
3 
3 
52 
4 
2 
" 30 
67 
5 
5 
70 
4 
4 
July I 
63 
0 
0 
82 
3 
3 
" 2 
100 
10 
0 
" 3 
120 
4 
I 
74 
0 
0 
4 
113 
90 
" 5 
13^ 
I 
I 
80 
0 
0 
6 
99 
I 
I 
59 
0 
0 
" 7 
8 
59 
0 
0 
0 
0 
" 9 
0 
0 
" 10 
22 
0 
0 
0 
0 
From July 10 until the close of the flowering season cleft-petaled flowers con- 
tinued to appear occasionally, but much less frequently than during the early 
flowering period of the plants. 
