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Below-ground regenerative organs of stem (A) and root origin (B) in herbaceous plants. A rhizomatous plant (A) with rhizome (rh; light green) bearing an axillary bud (green ovals) in each node. A root sprouting plant (B) with roots (light brown) bearing adventitious buds (pink ovals) formed out of the modular structure. Different types of roots are depicted: adventitious root (ar), main root (mr) and lateral root (lr).
