[Arisaema-l] Arisaema root structure

[Greg Ruckert]

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
  ----- Original Message ----- 
  From: Henry 
  To: Arisaema Enthusiast Group (AEG) Discussion List (and other hardyAroids 
  Sent: Sunday, April 22, 2012 11:51 PM
  Subject: Re: [Arisaema-l] Arisaema root structure


        The Genus Arisaema: A Monograph for Botanists and Nature Lovers by Guy and Liliane Gusman says:

        "Arisaemas are herbaceous and the aerial shoot develops from a thickened, subterranean stem. Although it is usually buried in the soil and thus hidden, the stem is one of the main parts of an arisaema, important for both food storage and reproduction. Arisaema stems are either tubers or rhizomes." --from the chapter Morphology, p. 15
        [The bold text is as in the book.]

        Figure 1 in the Morphology chapter shows Arisaema serratum, they label the underground part a "subglobose stem." Also in the same illustration they label the underground part of Arisaema speciosum as "elongated stem." From page 13.

        On each species described later in the book there is a sub-head for Subterranean stem. They list most as "subglobose tubers."

        Arisaema dracontium is listed with an "elongated-globose tuber."

        Arisaema triphyllum is listed with a "globose tuber."

        Arisaema speciosum is listed as "a tuber cylindrical, annulate and horizontal."

        In flipping through the book I did not find any having a subterranean stem described as a rhizome.

        I would be happy to check a certain species if some doesn't have the book.

        --Henry Fieldseth
        Minneapolis, Minnesota, USA, Zone 4 (but almost zone 5 on the new maps) 



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