The point about convolute is that the next leaf in the module is
enclosed within the current leaf. In aroids all except Lagenandra, the
pachyneurium Anthurium, and Amorphophallus (all of which are involute) are
convolute, with the individual leaves supervolute. See Stearn, Bot. Latin 343-344,
Fig. 29 368 & 369.
[mailto:firstname.lastname@example.org] On Behalf Of Don Bittel
Sent: Friday, 15 January, 2010 1:05 PM
To: Discussion of aroids
Subject: Re: [Aroid-l] Supervolute vernation. Finally a photo!
have always thought that convolute and supervolute vernation were the same
thing. That is, that the left side is wrapped around the right side, which is
wrapped around itself. Or vice versa, with right around the left. Most aroids
are this way.
Pachyneurium anthuriums are involute, looking like two tubes side by side. This
includes the common birdnest types, as well as some heart shaped leaves, like
standleyi and watermaliense. Aren't there just these two types of
mention that most of the plants sold as hookeri are hybrids. I think that most
are true species of pachyneurium types, and if hybrids are certainly not
hybrids of hookeri, but are hybrids of schlectendallii or crispamarginata or
other common birdnest types.
in your last paragraph, you write about scalariform VERnation, which should be
scalariform VEnation, referring to the vein structure of the leaf. Just a typo,
but confusing to the subject at hand.
in south florida,
13 Jan 2010 15:02:44 -0600
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
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.
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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