[Arisaema-l] Arisaema root structure

Peter Boyce phymatarum at googlemail.com
Tue Apr 24 01:59:58 CEST 2012

No, because it has no 'tunic'. Think Crocus and Gladiolus for true corms. 


Geophytic aroids with underground storage organs are never cormous. Most,
regardless of the shape of the storage organ, are tubers. Rhizome has a very
specific morphological application and there are none in Arisaema that I
recall. Amorphophallus has two definite rhizomatous species, A. rhizomatosus
and A. hayi.


From: arisaema-l-bounces at science.uu.nl
[mailto:arisaema-l-bounces at science.uu.nl] On Behalf Of aaron floden
Sent: Monday, 23 April, 2012 7:49 PM
To: Greg Ruckert; Arisaema Enthusiast Group (AEG) Discussion List (and other
hardy Aroids
Subject: Re: [Arisaema-l] Arisaema root structure


So, if the "tuber" is a continuation of the stem and it is replaced annually
it is a corm in some species. The shape may be discoid, spherical, or ovoid,
but that does not change what it is.

 Like Greg said, there are rhizomes present on some species. In those it is
akin to Trillium and only the back end of it slowly decays as the growing
end continues. These are not replaced each season. Rhizomatum and
"decipiens" are both like this in Vietnam.

Why all the confusion?

Aaron Floden
E Tennessee, USA

--- On Mon, 4/23/12, Greg Ruckert <greg at alpacamanagement.com> wrote:

From: Greg Ruckert <greg at alpacamanagement.com>
Subject: Re: [Arisaema-l] Arisaema root structure
To: "Arisaema Enthusiast Group (AEG) Discussion List (and other hardyAroids"
<arisaema-l at science.uu.nl>
Date: Monday, April 23, 2012, 6:08 AM

A. rhizomatum and decioiens are both listed as rhizomes.

I collected rhizomatum living in very boggy, dark conditions and it
certainly looked like an Iris rhizome.


Greg Ruckert


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