1925] 



stout: studies of lythrum salicaria 



83 



and yellow anthers were intermingled, with the yellow predomi- 

 nating. For most of the 122 plants, the offspring of this first 

 semi-homomorphic plant, the anthers of the longer set of stamens 

 were much mixed in color. The summary for the entire series 

 is as follows. For the one mid-styled plant these anthers were 

 uniformly all dark. For the nine long-styled plants, seven had 



Figures 1-6. Flowers typical for the four forms in the one species Lythrum 

 Salicaria. The three older forms are the short-styled (i), the mid-styled, (2) 

 and the long-styled (5). Flowers of the new and ^eini-homomorphic form are 

 shown at 3, 4 and 6; the anthers of the longer set of stamens are all purple 

 in 6, all yellow in 4, and yellow or purple intermingled in 3. The short stamens 

 and pistils are, except in a few cases, entirely enclosed within the calyx. The 

 magnification is almost two times natural size. 



only the yellow anthers typical of this form and two had colors 

 intermingled. For the 60 plants of the new form, the long sta- 

 mens of six were wholly dark (see fig. 6), 25 were wholly yellow 

 (see FIG. 4) and for 29 there was a mixture of both colors. For 

 the intermediates, only dark stamens were found for six, only 

 yellow for 21, leaving 25 with the colors intermingled. For a 

 large number of plants in this series, the color of the longer set 

 of stamens was highly variable. The relative number of dark 

 and yellow stamens varied greatly for different individuals; it 



