Rib (cactus)

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Young plants of Echinocactus grusonii

In the cactus family, the rib is the fused podaria of a row of leaves .

The fusion of the podaria and the development of ribs in the youth stage of Echinocactus grusonii can be observed particularly well, the seedlings of which still have distinct warts . With increasing age there is an increase in the divergence number , i. H. the number of leaf rows and thus an increase in the number of ribs.


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