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A non-blooming Pinellia may be confused with Arisaema.
The female part of spadix is fused to the spathe, and the spadix has usually a long tail-shaped appendix.
The genus belongs to the subfamily Aroideae, tribe Arisaemataceae.
There are about 8-10 species in the genus.
 pedatisecta |  ternata |  tripartita |
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David Scherberich: Pinellia | |