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===Adventitious structures===
Plant structures, including, roots, [[Bud|buds]], and [[Shoot (botany)|shoots]], that develop in unusual locations are called ''adventitious''.{{cn|date=June 2025}}
Adventitious roots and buds usually develop near the existing vascular tissues so that they can connect to the [[xylem]] and [[phloem]]. However, the exact ___location varies greatly. In young stems, adventitious roots often form from [[Ground tissue#Parenchyma|parenchyma]] between the [[vascular bundle]]s. In stems with secondary growth, adventitious roots often originate in phloem parenchyma near the [[vascular cambium]]. In stem cuttings, adventitious roots sometimes also originate in the [[Callus (cell biology)|callus]] cells that form at the cut surface. Leaf cuttings of the ''[[Crassula]]'' form adventitious roots in the epidermis.<ref>McVeigh, I. 1938. Regeneration in ''Crassula multicava''. ''American Journal of Botany'' 25: 7-11. [https://www.jstor.org/stable/2436624]</ref>
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