Evans: TAXILEJEUNEA PTEROGONIA 123 
sis, although usually with fewer leaves. One of those examined 
bore two underleaves with the corresponding leaves and then a 
-perianth with its involucral leaves; the subfloral innovation arising 
at the base of the inner bract bore a single leaf and underleaf and 
then a second perianth; this process was repeated twice, the 
subfloral innovation borne below the last inflorescence being 
simple and very rudimentary. In this way a one-sided cymose 
inflorescence was formed with four crowded perianths along its 
upper side. Similar, relatively simple branch-systems are shown 
in Fics. 12 and 13, both of which were drawn from the same plant; 
jn FIG. 12, five crowded inflorescences are present; in FIG. 13, three. 
In contrast to this example a relatively complex branch- 
system may now be considered. In one of those studied the 
original branch bore two underleaves and a female inflorescence, 
just as in the first example, and the subfloral innovation was 
tipped with a second female inflorescence after bearing a single 
leaf and underleaf; the first inflorescence, however, bore a second 
innovation in the form of a short male spike at the base of its 
outer bract, and the second female inflorescence bore a female 
branch in the same position, thus lying in a fork between its two 
innovations. The first of these innovations (that arising at the 
base of the outer bract) bore two underleaves (with their corres- 
ponding leaves) and then a perianth with its bracts, innovating 
on its inner side; the innovation thus formed bore an underleaf, 
a leaf with a short male spike at its base and then another un- 
fertilized female flower with two subfloral innovations—one a 
short male spike and the other a female branch, bearing a third 
female inflorescence after forming three underleaves with the 
corresponding leaves. Beyond this third female inflorescence, 
which remained unfertilized a fourth and fifth, both unfertilized 
and borne on very short innovations, were developed, the branch- 
system being brought to a conclusion by a sterile and rudimentary 
innovation, just as in the case of the first branch-system described. 
The second innovation of the second female inflorescence was 
similar to the first bearing in all four female inflorescences and a 
single male spike, the latter arising as a subfloral innovation. This 
example, which bore thirteen female inflorescences in all, will give 
some idea of the complexities encountered, although an even more 
intricate condition might have been selected for description. 
