Figure 35 18 Primary and secondary growth of

Figure 35. 18 Primary and secondary growth of a stem (layer 1) (a) Primary and secondary growth in a two-year-old stem 1 Pith Primary xylem Vascular cambium Primary phloem Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Epidermis Cortex

Figure 35. 18 Primary and secondary growth of a stem (layer 2) (a) Primary and secondary growth in a two-year-old stem 1 Pith Primary xylem Vascular cambium Primary phloem 3 Xylem 2 Growth ray Primary xylem Secondary xylem Vascular cambium Epidermis Cortex Phloem ray Cork 4 First cork cambium Primary phloem Secondary phloem Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings

Figure 35. 18 Primary and secondary growth of a stem (layer 3) (a) Primary and secondary growth in a two-year-old stem Epidermis Cortex Primary phloem Vascular cambium Primary xylem Pith 1 Pith Primary xylem Vascular cambium Primary xylem 3 Xylem 2 Growth ray Primary xylem Secondary xylem Vascular cambium Epidermis Cortex Phloem ray Cork 4 First cork cambium Primary phloem Secondary phloem Periderm (mainly cork cambia and cork) th Grow 6 9 Bark Primary phloem 8 Layers of periderm Secondary phloem Vascular cambium Secondary xylem Primary xylem Pith Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Secondary 7 Cork xylem (two years of 5 Most recent production) Secondary phloem cork cambium Vascular cambium