Jeffrey and Torrey . — Transitional Herbaceous Dicotyledons. 239 
six foliar traces are relatively very much larger in size than they are in the 
companion illustration, a frequent condition of contrast between woody and 
herbaceous axes in the same genus. The six leaf-traces of the herbaceous 
stem are of such marked radial development that the foliar storage tissue is 
absent radially, and as a consequence is confined to a lateral position on the 
flanks of the traces of the leaves in their course in the stem. 
Text-fig. 3 shows the situation as regards the relation of the storage 
rays to the foliar traces in three dimensions. The left-hand diagram repro- 
Text-fig. 2. Diagram of the nodal regions of a woody and an herbaceous species of Clematis. 
duces the topographical relations of leaf-trace and foliar ray in the slender 
herbaceous region of the stem. To the left of the illustration lies a foliar 
ray with its contained leaf-trace. The trace is represented below in 
tangential long section, while above, on account of the fact that it turns 
obliquely outwards or radially in its course towards the base of the leaf, it 
is seen in somewhat oblique transverse section. In the transverse view of 
the ray is shown a solid mass of storage tissue representing the enlarged 
foliar gap. To the right of the diagram under discussion is shown the radial 
