E. S. Salmon and H. Wormald 251 



until 1919 when three plants, viz. J 11 ( ? ), W 49 {^), OB 4 («/'), were 

 observed with leaves which, compared with those of the plants around 

 could be described as "light green"; all three in 1920 again had light 

 green leaves. It would appear therefore that the pale colour is charac- 

 teristic of these plants and is to be looked uj)on as a distinct variation 

 from the normal type^ The three very early ^ plants, Z17, Z42 and 

 OG 4 have also a tendency to produce leaves of a paler green than is 

 usually met with. Several plants had been noted in 1919 as having 

 " rather light green " leaves and the same description was applicable in 

 1920 to some of them ; others however showed no distinctive paler colour 

 in 1920 and in these cases the change was probably merely of the nature 

 of seasonal fluctuation. 



BB 16 ( $ ) is a plant which had leaves of a " dark green " colour as 

 compared with surrounding plants, in 1919, and the same character re- 

 appeared in 1920. OD 24 ($ ) is another plant with dark green leaves. 



(6) The Length of the Laterals. 



In the great majority of cases the laterals (primary branches of the 

 main stems) reach a length of from four to five feet. In some instances 

 however plants which have consistently produced laterals of a much 

 shorter length have been noted. An extreme case is O A 5 (cT ) a plant 

 which has been under observation for five seasons but has never pro- 

 duced laterals exceeding one foot in length ; this plant has also short 

 bines which usually do not reach the top wire (see above, p. 243), while 

 the plants with long laterals have bines which readily reach the top 

 wire and grow along it or fall over to produce a dense " head " of leaves 

 and inflorescences. Other plants with laterals shorter than the average 

 are 



W36 ((/), maximum length of laterals about 2 ft. 6 inches, 

 Z 58 ( $ ), OD 24 ( $ ), OC 11 {^) maximum length of laterals about 8 ft. 



Plants of this type, when compared with the usual type, show a lack 

 of vigour, the bines being shorter and thinner. Whether this is due 

 to a pathological condition or whether the plants possess a factor for 

 " shortness " is not known. This shortness of bines and laterals would 

 seem however to be an inherent character of some hop plants. Thus in 

 the hop-garden at Wye College there is a cT hop plant Ref. no. J 36 

 (seedling of a cultivated vai-iety) which was planted out in 1911 and has 



1 Varieties (^ and $) oi H. Lupulus possessing "golden" (yellow-green) leaves are 

 known (7). 



