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Cross section of a root: axis of
the plant which grows in the opposite direction from the stem, maintain
the plant in place and absorbs nutrients. Piliferous stratum: set of cells on the outer layer that carry
the root hairs. Cortex: part of the root that protects the pith. Xylem: woody parts of the root. Phloem: vessels through which sap circulates. Pith: central part of the root. Phellogen: part of the root that produces cork.
Photo :
EN : Leaf
margin
FR : Bords
du limbe
ES : Bordes
del limbo
The leaf margin is characteristic for a
genus and aids in determining the species.