SEEDLING STRUCTURE IN THE LEGUMINOS, 9 
move to join the polar groups. Immediately below the node the bundles 
from polar and lateral xylems respectively are almost contiguous, but they 
retain their individuality, and so pass out to the cotyledons ; each cotyledon 
receives five groups of xylem, viz. a median root protoxylem (over which the 
phloem is interrupted), the two polar metaxylems, and the pair of bundles 
derived from the lateral root xylems ; the phloem is in two long bands, which 
arch over the metaxylem groups (fig. 28). 
The reduction of the octarehy of the root to tetrarchy in the hypocotyl i is а 
rare occurrence, and though constant in this species has not. been observed 
elsewhere in the Leguminose. 
РітнесоговісМм Uneuis-cari, Benth. (Pl. 2. figs. 29-33.) 
Erect shrub or tree. Hypocotyl narrowing slowly to a long primary root. 
Cotyledons enclosed in the testa, petiolate, sagittate at the base.  Epicotyl 
with long tapering internode, bearing first one or two minute trifid scales 
and then alternate pinnate leaves. 
The root contains a fair-sized pith and four similar equidistant wedges of 
xylem, with alternating groups of phloem (fig. 29). As we ascend towards 
the hypocotyl the section becomes elliptical and the xylems spread into the 
V-shape ; the polar groups remain continuous for some time, while the inter- 
cotyledonary groups separate into triads (fig. 30). At the collet the polar 
xylems have also divided into triads, and the metaxylems of each have fused 
with the adjacent metaxylems from the lateral xylem triads. The four 
protoxylems remain in their original positions. The phloems extend in a long 
band over each joint metaxylem group (fig..31). Just below the cotyle- 
donary node the metaxylem bands divide again with the corresponding 
phloem ; the original lateral metaxylems are left behind to pass into the 
epicotyl together with the lateral protoxylems, while each cotyledon receives 
only the polar triad (fig. 32). The first epicotyledonary internode contains 
six endarch collateral bundles, three passing to each of the first two leaves ; 
these are derived from the lateral root-poles (fig. 33). Thus, two of the 
root xylems are cotyledonary, two plumular, this including both proto- and 
metaxylem. 
The following histological features may be noted :— The outer cortex of the 
root and hypocotyl contains strong collenchyma. There is a very strongly 
thickened perimedullary zone of fibres embedding the primary xylems. 
The anatomy shows considerable differences from that of P. Saman, and 
may be compared rather with Cesalpinia sepiaria. 
ADENANTHEREE 
ADENANTHERA PAVONINA, Linn. (Pl. 2. figs. 34-37.) 
An erect tree. The hypocotyl narrows rather rapidly to the primary root, 
