Abstract
1. The differentiation of the complex vascular network of the node in Ricinus communis is traced throughout the stem apex. 2. The development of the vascular elements of the septum in general parallels that in the axis. The network differentiates from provascular strands. Spiral vessels in the axis precede those in the septum, while secondary thickening is initiated in both at the same time. 3. It appears that leaf traces entering the stem run downward through only two internodes without change. Thereafter they may either anastomose, diverge right or left of the incoming traces and continue downward, or be deflected horizontally across the nodal septum. Thus it is possible that all leaf traces take part in the formation of at least one nodal network.
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