vitalba , Z,., with Special Reference to Trimery and Abortion. 113 
flower may exhibit a numerical superiority not only over that of the 
corresponding interiorly placed lateral flower but also over that of the 
terminal member of its cyme. 
Examples of branched carpels were found in eighteen fruit heads, or 
about 1*5 per cent. Of course this represents under 1 per cent, of the 
total number of carpels examined, but in view of the fact that only where 
the process of fission is incomplete is the phenomenon recognizable we may 
conclude that such is probably by no means infrequent and may account 
for the variation about the different modes. 
Total 
No . of 
Carpels . 
Abortive Carpels in Clematis vitalba . Correlation between Fertile 
and Abortive Carpels. 
Number of Abortive Carpels . 
01 2345678910 11 12 13 14 15 16 17 18 19 Totals . 
4 
1 
4 
8 
8 
9 
18 
15 
18 
34 
- 38 
47 
70 
55 
1 67 
102 
70 
57 
97 
5 2 
53 
- 58 
3i 
J 9 
- 38 
16 
13 
9 
9 
3 
3 
3 
4 
1 
1 
9 
1 
■g! 
2 
10 
11 
1 
I 
12 
3 
2 
I 
1.3 
1 
2 
I 
14 
1 
^ - 
5 
15 
1 
3 
2 
16 
4 
6 
2 
I 7 
3 
4 
4 
18 
5 
12 
6 
19 
4 
5 
5 
20 
11 
6 
10 
21 
6 
18 
H 
22 
7 
8 
13 
2 3 
5 
9 
J 5 
24 
14 
T 4 
16 
2 5 
9 
10 
17 
26 
6 
8 
13 
2 7 
15 
r 5 
14 
28 
6 
12 
4 
29 
2 
16 
7 
30 
5 
7 
8 
31 
1 
7 
2 
3 2 
1 
3 
4 
33 
1 
4 
4 
34 
2 
1 
3 
35 
H 
2 
... I 
36 
RH 
2 
37 
--- 
' v S 
1 
38 
h/m 
2 
39 
- 
1 
' ■ 
40 
- 
- 
1 
4 i 
- 
-H 
1 
4 2 
1 
46 
47 
5 i 
'otals 
115 
177 
179 
2 
2 
2 
1 
2 
7 
6 
1 1 
8 
1 1 
15 
11 
9 
20 
7 
6 
10 
10 
2 
5 
1 
3 
1 
2 
1 
1 
3 
6 
9 
7 
6 
7 
12 
5 
8 
10 
5 
7 
6 
1 
4 
4 
2 
1 
2 
1 
1 1 1 
3 - - 
2 1 1 
1 - - 
1 - - 
- - 1 
1 - - 
3 5 
1037 
113 70 54 42 37 28 19 12 13 7 
A bortion. 
Abortive achenes are of such frequent occurrence in Clematis vitalba 
that a relatively small proportion of the seed heads consist entirely of fertile 
fruits. The abortive achenes can be recognized by the fact that the body of 
I 
