English: Fig. 11.—Diagram of the course of the vascular bundles as they come down from the leaves into the stem. The horizontal dotted lines represent the levels of sucessive leaves; the triangular white area beneath the upper letter z is the insertion of a leaf. Each group of bundles form a leaf, as mm, ms, ms, etc. (see text), descends into the stem, and joins with the bundles from other leaves after running through several internodes. The other letters refer to the bundles from other leaves. (After Frank.)