378 Tricotyloiis Races. 



cur. These anomalies are found especially on the seed- 

 lings and usually replace the first or second whurl of 

 leaves and rarely the third or a higher one. In the 

 spring of 1894 I had a large crop of the red flowered 

 variety which produced about l^c of these abnormali- 

 ties amongst many hundred seedlings. In subsequent 

 years I had even larger numbers. In the spring of 1897, 

 for instance, I had about 10/6 in very extensive sowings 

 of a tricotylous race with striped flowers. The most 

 important cases are, of course, those in which the rudi- 

 ments of the opposite leaf and of the terminal bud can 

 be clearly seen with the naked eye alongside the terminal 

 leaf. I have frequently planted out such plantlets in the 

 hope of growing them for my experiments, but usually 

 without success. Either they did not develop a main 

 stem at all, or only a delicate one ; often there arose from 

 the axil of one of the lower leaves or of one of the 

 cotyledons a lateral branch which, however, remained 

 weakly. 



Sometimes the organ situated opposite the terminal 

 leaf is somewhat better developed, but usually it cannot 

 be seen withotit the help of a microscope. If the terminal 

 structure has only one vein I regard it as a single leaf 

 (Fig. 81 B). But if it has two points \vith a double or 

 divided midrib (Fig. 81 C) it obviously represents the 

 two leaves of a pair. Sometimes these are fused together 

 laterally; the peduncle is, however, considerably broad- 

 ened and its point of insertion clearly recognizable. Fre- 

 quently, however, the peduncles are fused at their base, 

 at both sides, and form a little tube which embraces the 

 terminal bud. If the concrescence is of considerable 

 extent terminal ascidiae are the result, which, in most 



