Discussion:(fig. 54). This inflorescence axis is quite similar to that of the above variety, but several features are worthy of note. The bundles at the exterior of the sclerenchyma ring are much smaller than those in the interior of the stem. The outermost layer of selerenchyma is much more thick-walled than interior layers, which grade into the thin-walled condition of the central ground tissue. Exceptionally large protoxylem lacunae, and intergradation to a graminean type of bundle construction may be seen.