959 
the Inflorescences and Flowers of Ephedra. 
axillary bud. The vegetative axillary bud receives a median trace , 1 derived 
from the two foliar bundles, which passes out first to the abaxial side of the 
bud and there divides into two again ; also two lateral bundles which supply 
the adaxial side of the bud (Text-fig. IV. 1-5). The lateral traces are 
derived in some small part from the foliar bundles as they pass out to the 
subtending leaf, but chiefly from branches of the adjoining main bundles. 
In the case of the ovule none of the elements composing the two lateral 
traces are derived from the foliar bundles, and the adaxial side of each 
ovule is entirely supplied by two of the four main bundles left in the axis, 
which do not branch but themselves form the lateral traces ; consequently 
no vascular elements remain to supply the minute stem apex. 
Text-fig. iv. 1-5. Diagrams of series of transverse sections through the node of the vegetative 
stem ( E . nebrodensis). m = median axillary bundle; L = lateral axillary bundle; B = bundle 
supply of subtending bract; a , b, c, d = four main bundles, which fork to form eight, a 1 a i b 1 bv c^d^, 
in between each node ; m 2 = median axillary bundle for axillary bud at next node ; T = bridge of 
transfusion tracheides connecting the bract bundles with the median axillary bundle. 
The course of the bundle system in the ovule 2 itself is very simple. The 
three bundles, one median axillary and two lateral, which enter the base of 
the ovule usually each branch into three ; sometimes the median or abaxial 
one remains unbranched. In either case the median bundle does not 
contribute anything towards the supply of the outer integument, but the 
latter receives the middle branch from the other two groups only . 3 The 
outer integument thus receives two bundles which traverse the angles 
1 The earlier account by Strasburger states that this is not the case : the vascular supply of the 
ovule differing in this respect from that of an ordinary axillary bud ; 1872, pp. 78 ff. 
2 See also Strasburger, 1879, p. 99. 
3 The two bundles supplying the outer integument in Welwitschia originate in a very similar 
manner, each being derived from the middle bundle of a group of three; Sykes, 1910, p. 197, 
Diagram IX, especially Case 2. 
