International Aroid Society

Dear Marek & Steve:=A0

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 I am looking at these images andwondering if there is any difference at all in those terms (which has alwaysbeen my understanding, ie. That they are two terms that meant the same thing. Ibelieve if you=A0 inverted the images they would be the same. All leaves aredeveloped from the apical meristem and so far as I know there is a continuous seriesof leaves being produced and the younger ones are always coming out inside the otherleaves. Can someone better explain how these two differ?

Tom

From: aroid-l-bounces@gizmoworks.com[mailto:aroid-l-bounces@gizmoworks.com] OnBehalf Of Marek Argent
Sent: Thursday, January 21, 20106:26 PM
To: Discussion of aroids; SteveLucas
Subject: Re: [Aroid-l] Supervolutevernation. Finally a photo!

Dear Steve,

So, I suppose that the term"supervolute" refers to the vernation of a solitary leaf

and "convolute" is thesame but in reference to a sequence of leaves

or a spadix within a spathe.

I modified a little the drawingsent by you by placing the next leaf and we have the same.

In my library I found a document on Monstera obliqua and there is a photo

of convolute vernation of leaves(page 5).

Marek

----- Original Message -----
From: ExoticRainforest
To: Discussionof aroids ; MarekArgent
Sent: Wednesday,January 20, 2010 5:17 PM
Subject: [Aroid-l]Supervolute vernation. Finally a photo!

I screwed up bigtime and inserted the wrong drawing.

These are the correct drawings from Stern's showing the placement of themidrib. It appears the only difference in supervolute and convolute is aleaf forming around another leaf but frankly I still don't have a completelysatisfactory explanation. I try almost daily on my website to makesubjects like this clearer for anyone interested in aroids that does not haveor is not interested in earning a degree in botany. I am now to thepoint of completely removing the subject since I am no longer sure I fullyunderstand it or can help anyone else to understand.

I don't believe any definition in print in any of the 5 botanical dictionaries Inow own make the distinction (if any) between convolute and supervoluteclear. At least in the dictionaries they appear to be synonymous and areone and the same.

Steve
www.ExoticRainforest.com

Marek Argent wrote:
Steve,

We cannot talk about vernation types not seeing themidrib as it is presented on the second drawing.
It can as well be a half of a leaf rolledinvolutely.

The third drawing (convolute) is what I thought about(but I was afraid to say) -
that the term "convolute" may refer only toat least two objects
like one leaf inside another one or a spadixwrapped by a spathe.

Anyway in my cord photos, the third type, althoughprobably not occuring in Araceae
is possible, so it must have a name too.

It's becoming complicated...

Marek
-

These drawings arefrom William T. Stern's Botanical Latin, 4th edition.

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