Help on identification: Arisaema dracontium vs. Pinellia pedatisecta

Malkmus, Bjoern malkmus at VERWALTUNG.UNI-MAINZ.DE
Fri Aug 6 01:00:51 CEST 1999

Many thanks to all who helped in identifying this species.
Indeed, plants are a form of Pinellia pedatisecta and not the
Arisaeam dracontium.

>1.Pinellias never have more than one seed per fruit.
>2.The Pinellia seedhead flops down on the ground to disperse the
>seeds, which are still green when ripe.
>3.The Pinellia flowering stem has no leaves. The leaves arise
>directly from the tuber.
>4.The Pinellia spadix is fused to the back of the spathe for some
> distance.
>5.Pinellias bloom several times in each growing season.
>6.All Pinellias are monoecious (ie, male and female flowers on the
>same inflorescence

All applies to the plants in my cultivation, except that their size is
much bigger than mentioned by George R. Stilwell Jr.:

> I think the easiest way to distinguish A. dracontium from P. pedatisecta
> is by size. A. dracontium is much, much taller (up to a meter), P.
> pedatisecta is rarely over 10 to 12 cm tall.

Maybe it's a giant form, but ALL plants are at least 30 cm, the flower
stalk with the spathe even more !
I wonder as I received plants from three different sources and all
show the same "unsual" (?) height ... or was it 10 to 12 inches, which
might get closer to the actual height ?


Bj=F8rn Malkmus

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