142 HETBEOSTYLED TEIMOEPHIC PLANTS. Chap. IV.- 



thers. The end of the pistil is generally bent upwards 

 at right angles. The six longest stamens, with their 

 pink filaments and green pollen, resemble the coKre- 

 sponding stamens of the mid-styled form. But accord- 

 ing to H. Miiller, their pollen-grains are a little larger, 

 viz. 9J-10J, instead of 9-10 in diameter. The six 

 mid-length stamens, with their uncoloured filaments 

 and yellow pollen, resemble in the size of their pollen- 

 grains and in all other respects the corresponding 

 stamens of the long-styled form. The difference in 

 diameter between the grains from the two sets of 

 anthers in the short-styled form is as 100 to 73. 

 The capsules contain fewer seeds on an average than 

 those of either of the preceding forms, namely 83 "5 ;, 

 and the seeds are considerably smaller. In this latter 

 respect, but not in number, there is a gradation 

 parallel to that in the length of the pistil, the loag- 

 styled having the largest seeds, the mid-styled the 

 next in size, and the short-styled the smallest. 



We thus see that this plant exists under three 

 female forms, which differ in the length and curva- 

 ture of the style, in the size and state of the stigma* , 

 and in the number and size of the seed. There ar^ 

 altogether thirty-six males or stamens, and these can 

 be divided into three sets of a dozen each, differing 

 from one another in length, curvature, and colour of 

 the filaments — in the size of the anthers, and especially 

 in the colour and diameter of the pollen-grains. Each 

 form bears half-a-dozen of one kind of stamens and 

 half-a dozen of another kind, but not all three kinds.. 

 The three kinds of stamens correspond in length with 

 the three pistils : the correspondence is always between 

 half of the stamens in two of the forms with the pistil • 

 of the third form. The following table of the diameters 

 of the pollen-grains, after immersion in water, from 



