the Inflorescences and Flowers of Ephedra. 961 
vascular bundles in this case is seen in Text-fig. VI. 1-10. Text-fig. VI. 8 
represents the level above the origin of the uppermost bracts (b 3 ), and it is seen 
that four bundles run into the base of the single ovule. Of these the two 
smaller represent the median traces derived from the bract bundles and the 
two larger each represent two of the main axial bundles fused together. 
In all the uniovulate cones of E. altissima examined, the course of the 
bundles in the cone axis below this level only differed from that in E. di- 
stachya in that six bundles instead of eight occurred in the internodes (six 
Text-fig. vi. Illustrates three transverse series through the female strobilus ol E. altissima , 
described in text. Case 2 = 1-10, Case 3 = 6'-io', Case 4 = 6"-io"; letters as before. 
is also the number in the peduncle, p. 957). This appears to be the result 
of the tendency of the four main axial bundles, which ultimately supply 
the two ovules in the biovulate cone, but which in the uniovulate cone fuse 
into two in the base of the ovule, to fuse into pairs lower down also. 
Cases 3 and 4. In other uniovulate cones the integument is three- 
angled and receives three vascular bundles. The two median traces may 
still both be formed from the bract bundles as in Cases 1 and 2, but in 
Case 3 one of them divides into two in the base of the ovule, and the halves 
fuse with the two main bundles, so that three bundles run up into the ovule 
