1925] stout: studies of lythrum salicaria 85 



anthers there is variation between the color of long-stamens and 

 that of mid-stamens, with many, all of the same length, that 

 have the colors intermingled. It may also be stated that this 

 particular series of plants has shown variations in the number of 

 petals of flowers, giving in extreme cases, plants entirely apeta- 

 lous, a condition not observed thus far for any other culture. 

 Just what genetical changes are involved in the development 

 of the new form can be determined further only by continued 

 line breeding and by the character of progeny of crosses with 

 the other forms. The large number of intermediates ranging 

 toward the long-styled form suggests a relationship between this 

 form and the mid-styled form from which the new form arose. 

 The semi-homomorphic type of flower, is perhaps a reversion 

 toward a simpler homomorphic type of flower which was with- 

 out doubt the ancestral type of the species. 



Literature Cited 



Darwin, C. On the sexual relations of the three forms of Lythrum Salicaria. 

 Jour. Linn. Soc. Bot. 8: 169-196. 1865. 



. The different forms of flowers on plants of the same species. 



London, 1877. 



Stout, A. B. Studies of Lythrum Salicaria — L The efficiency of self-pollina- 

 tion. Am. Jour. Bot. 10: 440-449. 1923. 



