Differentiation in the Stem of the Sunflower . 495 
Text-fig. 5. (1) to (8) Sect ons of a median leaf-trace bundle at right angles to its course 
from the leaf-base through the node, showing accompanying phloem strands, which form a plexus 
on each side in the node, connecting with the phloem of adjoining bundles. (9) A lateral trace 
bundle entering at the node showing similar features. Lignified fibres heavily shaded ; phloem 
finely shaded ; secondary wood cross-hatched ; rows of vessels indicated in the primary xylem. 
Xylem of small satellites of the trace bundle black. (Resin canals omitted from (5) and (7).) 
