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 coloured 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 1. In A. filiforme, peduncles and petioles arise continuously from the rhizome but independently one from the other.
 

 
Figure 1. In A. filiforme, peduncles and petioles arise continuously from the rhizome but independently one from the other.
     
     
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