LIFE HISTORY OF TIMOTHY 
47 
Table 20. — Characteristics of timothy plants taken from the field January JO. 
1923, and grown under different conditions 
Treatment 
Average 
date 
when first 
head ap- 
peared 
Average 
date of 
full 
bloom 
Length 
of stem, 
including 
head 
Average 
number 
of elon- 
gated in- 
ternodes 
in haplo- 
eorm and 
culm 
Part of each plant transplanted to the field Jan. 22 June 11 June 29 
Part of each plant transplanted to the greenhouse Jan. 23 and 
retransplanted to the field May 26 June 9 : June 25 
Incfi.es 
41. £ 
29.: 
6.5 
10.3 
EFFECT ON LEAF GROWTH 
In the experiment conducted in 1922 the number of leaves per 
shoot was much larger on those plants which continued their growth 
during the winter in the greenhouse than on the plants which 
remained in the field. This record corresponds with results obtained 
from similar experiments in earlier years. 
EFFECT OX GROWTH OF ELOXGATED LXTERXODES 
In both 1922 and 1923 elongation of the internodes did not occur 
in the stems of the plants grown in the greenhouse until several 
weeks after they had been transplanted from the field, yet elongated 
internodes did begin to form earlier than on the plants which re- 
mained in the field. In each season there was an average number of 
approximately 6.5 elongated internodes in the haplocorm and culm of 
shoots with heads on plants grown in the field, while on plants 
grown in the greenhouse the number of elongated internodes per 
shoot varied approximately from 9.5 to 11.5. 
The lower internodes of the stems of plants grown in the green- 
house were relatively short and did not increase in length from the 
lower part of the culm upward, neither did haplocorms form at the 
bases of these stems in the way in which they develop on plants in the 
field in late spring and early summer. The appearance of stems 
grown under both conditions is illustrated in Plate 11. 
On a large proportion of those timothy stems in meadows which 
become elongated and produce heads late in the season during the 
autumn months supernumerary elongated internodes are quite com- 
mon, and either there is a relatively small haplocorm or else it is 
entirely absent. In these respects the shoots which began their 
growth in length in the greenhouse abnormally early in the spring 
resemble the shoots which become elongated in the field in late 
fall. 
EFFECT ON TIME OF HEADING AND BLOOMING 
In 1922 the average date at which the heads appeared on the 
plants grown in the greenhouse during the winter was a few day- 
later and in 1923 it was 2.6 days earlier than on the plants grown 
in the field. In both seasons the difference was relatively small. 
