xylem produced to the interior of the vascular cambium during secondary growth.

secondary xylem (Wikipedia)

Xylem (blue) transports water and minerals from the roots upwards.

Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients. The word "xylem" is derived from the Greek word ξύλον (xylon), meaning "wood"; the best-known xylem tissue is wood, though it is found throughout a plant. The term was introduced by Carl Nägeli in 1858.

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