378 Tricotylous Races. 
cur. These anomalies are found especially on the seed- 
lings and usually replace the first or second whorl 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 \% 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% 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 
weaklv. 
mt 
Sometimes the organ situated opposite the terminal 
leaf is somewhat better developed, but usually it cannot 
be seen without 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 with 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 
