SEEDLING STRUCTURE IN THE LEGUMINOS.E. 55 
bract (fig. 104). The vascular system of the bract thus consists of a median 
and two lateral fibrovascular bundles, which anastomose with one another 
after its departure. 
The medullary xylem at the same time breaks along the minor axis into 
two pieces, and the piece on the side of the bract splits longitudinally ; so 
that two bundles are produced, each corresponding to one of the lateral 
phloems (Pls. 9. fig. 104; 8. fig. 105). — These bundles give off, towards the 
apex of the ellipse, branches which fuse on the major axis and so reform the 
polar bundle (connecting with the third leaf). At the same time each of 
these “ faisceaux réparateurs” gives off a group of fibres which fuse in the 
median plane in the cortex (fig. 104, arrows). 
At the second node the medullary xylem left at the other end of the 
ellipse splits longitudinally and repeats the process. Thus in the third 
internode a typical medullated stem-structure is produced, and this persists 
throughout the higher internodes. 
There is a certain amount of variation in the arrangement of the vascular 
strands in the epicotyl. The medullary xylem may never show the complete 
fusion into a solid core described above, but after the preliminary tangential 
fusion into two bands may break up again into four groups. The lateral 
phloem groups often fuse with one another, so that instead of four there may 
be only three or two such groups within the endodermis. 
DraGnaMs. (Pl. 9. figs. 98-104.) 
Cotyledonary xylem, solid black; phloem, dotted. Plumular protoxylem, cross-hatched ; 
metaxylem, line-shaded ; phloem, clear. 
v=xylem. p=plumular. 
p^ = phloem. c— cortical. 
feb fibrovascular bundle. Ci. & Cii.=the two cotyledons. 
fb= fibre bundle. Li. & Lii.=the first and second leaves. 
98—104 : collet — first epicotyledonary node. 
Vici ЁАВА, Linn. (Pls. 1. fig. 9; 8. figs. 106-108.) 
Erect annual, not climbing ; the diameter of the stem is greater than in 
the climbing Viciew. There is practically no hypocotyl, the root-like surface 
extending to immediately below the cotyledons. The main root is long and 
is much branched at the base, just beneath the cotyledons. The sharply 
quadrangular epicotyl develops early, and bears as usual two or three trifid 
bracts and then the large foliage-leaves, their arrangement being distichous 
in the intercotyledonary plane. 
The first epicotyledonary internode shows a different structure from that 
found in Pisum sativum and the climbing Viciew generally. А pith is 
present throughout, the arrangement of bundles in a ring being of the normal 
type, and there being no medullary xylem ; the usual cortical bundles are 
present, however. In fact, the structure is similar to that which is found in 
