[Arisaema-l] Arisaema root structure

[Henry]

According to this website, corms have a basal plate and a tunic covering them, tubers lack these structures.

http://urbanext.illinois.edu/bulbs/bulbbasics.cfm

--Henry Fieldseth
Minneapolis, Minnesota, USA, zone 4

--- On Mon, 4/23/12, Henry <treehugger53ah at yahoo.com> wrote:

From: Henry <treehugger53ah at yahoo.com>
Subject: Re: [Arisaema-l] Arisaema root structure
To: "Arisaema Enthusiast Group (AEG) Discussion List (and other hardy Aroids" <arisaema-l at science.uu.nl>
Date: Monday, April 23, 2012, 7:31 AM

If I understand correctly, the tuber is not an extension of the stem. It is the stem. The parts we see above ground are simply the leaves and flowers.

--Henry Fieldseth
Minneapolis, Minnesota, USA, zone 4

--- On Mon, 4/23/12, aaron floden <aaron_floden at yahoo.com> wrote:

From: aaron floden <aaron_floden at yahoo.com>
Subject: Re: [Arisaema-l] Arisaema root structure
To: "Greg Ruckert" <greg at alpacamanagement.com>, "Arisaema Enthusiast Group (AEG) Discussion List (and other hardy Aroids" <arisaema-l at science.uu.nl>
Date: Monday, April 23, 2012, 6:48 AM

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.
Cheers,
Greg Ruckert


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