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Shoot apex (A) and stem (B) organization. Each leafy axis (B) ends in an apical meristem frequently protected in an apical bud (A). Each stem comprises a succession of metamers, i.e. the set composed by (1) one internode, (2) the node (i.e. insertion point of the leaves on a stem) located at its tip and (3) the corresponding one or several leaves and associated lateral buds (in grey on A; White, 1979; Caraglio and Barthélémy, 1997).
