Arisaema section Anomala. In this section, all species are evergreen and aseasonal. Petioles and peduncles emerge from a rhizome rooting all over. Roots are present everywhere along the rhizome. Usually the rhizome is internally colourd violet-purple. Its length may vary and, sometimes, very short rhizomes have been confused with tubers, such as in A. balansae. When leaves have been cut off for shipping, petiole and peduncle remains are still present.

  Figure 2. A. petelotii has huge rhizomes.
Figure 2. A. petelotii has huge rhizomes.

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