Chap. IV. LYTHRUM SALICARIA. 141 



styled or short-styled forms, 100 of them were placed 

 in a good balance, and by the double method of weigh- 

 ing were found to equal 121 seeds of the mid-styled or 

 142 of the short-styled; so that five long-styled seeds 

 very nearly equal six mid-styled or seven short-styled 

 seeds. 



Mid-styled form. — The pistil occupies the position 

 represented in the diagram, with its extremity con- 

 siderably upturned, but to a variable degree; the 

 stigma is seated between the anthers of the longest 

 and the shortest stamens. The six longest stamens 

 correspond in length with the pistil of the long-styled 

 form; their filaments are coloured bright pink; the 

 anthers are dark-coloured, but from containing bright- 

 green pollen and from their early dehiscence they appear 

 emerald-green. Hence in general appearance these 

 stamens are remarkably dissimilar from the mid-length 

 stamens of the long-styled form. The six shortest sta- 

 mens are enclosed within the calyx, and resemble in 

 all respects the shortest stamens of the long-styled 

 form; both these sets correspond in length with the 

 short pistil of the short-styled form. The green pol- 

 len-grains of the longest stamens are 9-10 in di- 

 ameter, whilst the yellow grains from the shortest 

 stamens are only 6; or as 100 to 63. But the pollen- 

 grains from different plants appeared to me, in this 

 case and others, to be in some degree variable in size. 

 The capsules contain on an average 130 seeds; but per- 

 haps, as we shall see, this is rather too high an aver- 

 age. The seeds themselves, as before remarked, are 

 smaller than those of the long-styled form. 



Short-styled form. — The pistil is here very short, not 

 one-third of the length of that of the long-styled form. 

 It is enclosed within the calyx, which, differently from 

 that in the other two forms, does not enclose any an- 



