96 BOTANICAL GAZETTE [AUGUST 
The vascular system of the spike is comparatively simple. 
From each spike there enter the stem 6-14 vascular bundles, which 
are arranged as in a typical dicotyledonous stem except that there 
is no interfascicular cambium (text fig. 7). Growth in thickness is 
entirely by the divisions of the fascicular cambium and the paren- 
chyma cells between the bundles. A single leaf trace passes from 
each segment of the perianth into the 4 13.4211 10 9 
axis of inflorescence. Thepaths ofthe 4: | | i a 
bundles were traced in detail through " 
the basal internode, the first node 
above the stem, and the first pair of 
flowers. One bundle, which is entirely 
free from the others, extends. from 
each of the two connate bracts into 
the axis. The first pair of bundles on 
the right and left sides of the axis 
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Fic. 7 Fic. 8 
Fics. 7, 8.—Fig. 7, cross-section near base of spike, indicating arrangement of 
vascular bundles; fig. 8, diagram showing arrangement of vascular bundles in lateral 
view in the first node and first pair of flowers of fig. 3: 1, 2, 3, 4,5, 6, 7, 8, same as 
in fig. a IN, level of first node; 1, 8, bundles entering the bracts; a, b, c,d, d, b,¢,4, 
tracheid strands entering the swollen portion of the inflorescence axis (fig. 4, ¢) ehow 
flower; A, B,C, A, B, C, bundles entering infl is from the flower (figs. 13,% 
20,0); 9, 10, II, 12, 13, 74, as in fig. 7. 

furnishes the traces for the swollen collar of the stem surrounding 
the flower. With these same bundles the vessels of the flowers 
are connected (text figs. 7, 8). The bundles beyond the first pair 
of flowers were not followed closely, but their distribution is 
apparently similar to the portion of the system here figured and 
described. 

