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Re: Supervolute vernation. Finally a photo!

  • Subject: Re: Supervolute vernation. Finally a photo!
  • From: "Marek Argent" <abri1973@wp.pl>
  • Date: Thu, 14 Jan 2010 15:49:56 +0100

I took a photo of an unflolding leaf of Zantedeschia aethiopica. Is this convolute venation?
The thick part is the midrib.
I also made a simple drawing. I think 1 is involute, 2 is convolute and how to draw supervolute?
Or 2 is supervolute?
----- Original Message -----
Sent: Wednesday, January 13, 2010 10:02 PM
Subject: [Aroid-l] Supervolute vernation. Finally a photo!

There are several types of leaf vernation when a new leaf first emerges. Vernation is simply the way a new leaf blade is rolled or folded as it begins to emerge from the cataphyll.

Although there are several forms of vernation in aroids the most common type is known as convolute vernation which describes the edges of a newly unfurling leaf blade which have both margins (edges) curled inward wrapping around each other. This is observed when the new blade emerges from the cataphyll and the wrapping of one margin is rolled over the other. The mechanism makes the emerging leaf present itself as a tube.

The second is known as involute vernation and is observed when a newly developing leaf emerges from the cataphyll when both margins (edges) on opposing sides of the leaf blade are rolled forming two inward facing tubes that meet at the midrib of the leaf. This type is not as common as convolute vernation.

The least common is known as supervolute vernation. I have been working for weeks to complete an article for the next issue of Aroideana (the journal of the International Aroid Society) to be published in August. That article attempts to make many of the terms used in scientific literature easy for a collector to understand and use. One of the most difficult definitions to write was the one for supervolute vernation since a definition did not exist in any of the scientific texts or journals I own. I couldn't even find a definition on the internet and the definition I found on the internet for "supervolute" was impossible to understand. Look it up and see if you can figure out what they are trying to say!

Finally my friend Leland Miyano sent a photo of a newly emerging leaf of Anthurium hookeri and the definition Dr. Tom Croat helped to clarify suddenly became crystal clear. Until I received this photo I had no real idea what supervolute vernation really meant.

supervolute vernation
Possessing a convolute arrangement in the folding or arrangement of a newly emerging leaf blade with one margin (edge) of the newly blade emerging rolled inward toward the midrib and the opposite margin rolled around the midrib as well as the remainder of the leaf in a manner similar to the coiled whorl at the end of a conch shell.

My thanks to Leland for the photo!

If you believe you are growing Anthurium hookeri you may want to look at this page!  I have been trying to find a specimen for years and so far have never been able to buy one since all the plants available for sale are not the species but instead are a hybrid. 

If the plant doesn't have scalariforme (ladder-like) vernation, glandular punctates (tiny black spots) on the back of the leaf, and produces white berries on an inflorescence instead of the read ones everyone believes the species should produce it isn't the real Anthurium hookeri.



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