252 Variation in Wild Hoi) 



been observed through nine seasons; during this period the laterals have 

 never exceeded a length of fifteen inches and the plant shows no evidence 

 of ill-health. 



(7) Characters associated with the Reproductive Organs in the ^ plants. 



In the (/• plants, as seen by the naked eye, no variation has been 

 observed in the general appearance of the flowers. When examined with 

 a lens however glands are to be observed on the perianth-lobes, on the 

 anthers (along the furrow)^ and, in some plants, on the receptacle. There 

 is evidence of variation in the glandulation of these organs. 



Glandvlation of the perianth lobes. The number of glands on the 

 perianth lobes varies with the insertion of the lobes on the short axis 

 bearing them. Of the five lobes forming the perianth of a flower, the 

 two lower ones (the outer ones of the bud) almost invariably bear very 

 few or no glands ; the inner lobes are generally far more glandular than 

 the outer ones and the innermost lobe may bear glands to the number 

 of twenty or even more. As a criterion of the variation in the glandula- 

 tion of the perianth lobes therefore only the innermost one is taken into 

 consideration and the numbers given below have that reference. 



The number of glands on the innermost perianth lobe is generally 

 from 10 to 15. In some plants the number was found, during five years, 

 not to exceed 10 ; in others the number has generally been about 20, 

 while in one instance 30 glands were found on a single lobe. When the 

 number is consistently below 10 the plant may be described as having 

 " few perianth glands " ; when the number is usually twenty or more 

 the plant is classified as having " many perianth glands." 



The following Table shows the maximum number of glands found 

 on the perianth lobes of certain plants during five years (three years in 

 one case). 



Maximum number of glands recorded for hmermost peria7ith lobe. 



Reference 

 number 

 of seedling 1916 1917 1918 1919 1920 



1 Glands on the perianth lobes and anthers of the ^ hop plant have been recorded by 

 Parlatore {Flora Italiana, Vol. iv. p. 304) and figured by Braungart(3) (p. 206). 



