380 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8 
since the sole superficial difference between the two types of seedlings is 
found at the primordial node. The frequency distributions in table 5 
show that the nodal number of bundles is in general lower in the hemitrimer- 
ous than in the trimerous seedlings. . It also indicates that they are higher 
in the hemitrimerous than in the dimerous seedlings. The averages and 
their probable errors in the second section of table 4 show that in each of 
Table 4. Mean number of bundles in central regions of internodes 
Central 
Central 
Central 
Central 
Line 
/ 
Region of 
Region of 
Line 
/ 
Region of 
Region of 
Hypocotyl 
Epicot}^ 
Hypocotyl 
Epicotyl 
Line 29 
Line 98 
3-3 
56 
12.36i.16 
i4.75±-i8 
3-3 
345 
12.03zb.02 
14.89 zb.04 
3-2 
43 
ii.74±.i6 
I2.93±.i7 
3-2 ... . 
43 
12.07 =t. 12 
13.72i.13 
2-2 
99 
8.45 ±.05 
I2.05±.02 
388 
9.24zb.04 
I2.I2zb.0I 
(3-2)-(3'-3) • 
— .62±.23 
— I.82it.2S 
(3-2^(3-3)' 
+ .04±.I2 
- T.I7±.I4 
(3-2)-(2-2) . 
+ 3.29±.i7 
+ .88±.i7 
(3-2)-(2-2) 
+ 2.83±.i3 
+ i.6ozb.i3 
Line 75 
Line 139 
3-3 
416 
12.19i.03 
1 5.47 ±-04 
3-3 • • • • 
106 
1 1.99 zb. 05 
1 5. 24 zb. 08 
3-2 
103 
12.32 d=. 08 
13.85 ±. 10 
3-2 ... . 
42 
II.36zb.i2 
13.93i.18 
519 
9-52±.05 
I2.26d=.02 
2-2 .... 
305 
8.i9dz.02 
I2.IOzb.OI 
(3-2)-(3-3) • 
+ .i3±-09 
— I.62=b.II 
(3-2)-(3-3) 
- .63 ±.13 
— I.3Izb.20 
(3-2)-(2-2) . 
+ 2.8o±.09 
+ i.59=h.io 
(3-2)-(2-2) 
+ 3.i7zb.i2 
+ i.83dz.i8 
Line 93 
Line 143 
3-3 
557 
12.29 =b. 03 
15.65zb.04 
3-3 • • • . 
221 
12.29 zb. 06 
l6.10zb.08 
3-2 
43 
I2.26±:.I3 
14.84rt.18 
3-2 ... . 
114 
II. 89 zb. 10 
13.68 zb.09 
563 
10.62 d=. 04 
12.19zt.02 
2 -2 ... . 
420 
8.66±.04 
12.36zb.02 
(3-2)-(3-3) ■ 
- .03=b.i3 
- .8izb.i8 
(3-2^(3-3) 
f3-2)-(2-2) 
— ..40zb.I2 
— 2.42db.I2 
(3-2^(2-2) . 
+ i.64±.i4 
+ 2.65zt.T8 
+ 3-23±.ii 
+ i.32zb.09 
Tabi-E 5. Distribution of mimber of bundles in central region of epicotyl 
10 
II 
12 
13 
14 
16 
17 
18 
19 
20 
2 1 
22 
Total 
Line 29 
3-3 
I 
3 
1 1 
13 
15 
A 
2 
4 
I 
I 
56 
3-2 
2 
3 
19 
4 
6 
6 
2 
I 
43 
2-2 
97 
I 
~" 
99 
Line 75 
3-3 
3 
16 
63 
164 
93 
41 
27 
4 
4 
I 
416 
3-2 
3 
16 
28 
27 
14 
9 
4 
I 
103 
2-2 
I 
4 
422 
58 
21 
10 
3 
519 
Line 93 
3-3 
5 
18 
47 
236 
129 
56 
51 
10 
4 
I 
557 
3-2 
5 
4 
9 
13 
5 
3 
2 
2 
43 
2-9 
I 
6 
483 
42 
20 
10 
I 
563 
Line 98 
3-3 
8 
24 
69 
176 
49 
9 
7 
I 
I 
I 
345 
3-2 
I 
6 
12 
13 
8 
2 
I 
43 
2-2 
352 
27 
7 
I 
I 
388 
Line 139 
106 
3-3 
8 
21 
38 
24 
9 
4 
2 
3-2 
2 
6 
12 
8 
6 
5 
I 
2 
42 
2-2 
278 
23 
4 
305 
Line 143 
3-3 
5 
9 
19 
54 
49 
37 
31 
9 
6 
2 
221 
3-2 
31 
19 
37 
17 
6 
2 
2 
114 
2-2 
318 
66 
27 
5 
4 
420 
