We thus see that this plant exists under three female forms, which differ in the length and curvature of the style, in the size and state of the stigma, and in the number and size of the seed. There are 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. Table 4.a of the diameters of the pollen-grains, after immersion in water, from both sets of stamens in all three forms is copied from H. Muller; they are arranged in the order of their size:-- TABLE 4.a. Lythrum salicaria. Diameters of pollen-grains after immersion in water. Column 1: Source of Pollen-grains. Column 2: Minimum diameter. Column 3: Maximum diameter. Longest stamens of short-styled form : 9 1/2 : 10 1/2. Longest stamens of mid-styled form : 9 : 10. Mid-length stamens of long-styled form : 7 : 7 1/2. Mid-length stamens of short-styled form : 7 : 7 1/2. Shortest stamens of long-styled form : 6 : 6 1/2. Shortest stamens of mid-styled form : 6 : 6. We here see that the largest pollen-grains come from the longest stamens, and the least (smallest) from the shortest; the extreme difference in diameter between them being as 100 to 60.