Page 03 – Stem
Fig. 4 . Stem. Radial section of a stem of a plant just before floral differentiation, i.e., 16 months old, to show the gross internal structure. A, B, and C indicate the levels at which the transverse sections illustrated in Fig. 5 were made. Soil roots and leaves have been cut off close to the surface of the stem. axr, zone of axillary roots; c, cortex; gvb, girdling band of vascular bundles, in cross section; lb, leave bases; rp, root primordium; s, stele; sr, zone of soil roots; vn, vascular network at the boundary between the cortex and stele. One-half actual size.