Cambium - a thin formative layer between the xylem and phloem of most vascular plants that gives rise to new cells and is responsible for secondary growth. (Ref: http://www.merriam-webster.com/dictionary/cambium)
Cambium - a thin formative layer between the xylem and phloem of most vascular plants that gives rise to new cells and is responsible for secondary growth. (Ref: http://www.merriam-webster.com/dictionary/cambium)