No. 1 shows the involute vernation, both halves of
the leaf are rolled independently. This is observed in the genus
Lagenandra, but not only, what confirms the photo of Amophophallus bulbifer
leaflet unfolding involutely which I sent in the prevoius message.
No. 2 is the most common type of vernation in
Araceae, it was depicted in the photo of Zantedeschia leaf I sent
previously. as I know a little Latin, I would call it supervolute. "Super"
means "over" "above". One half of a leaf is wrapped by the other half, the
internal half remains rolled until the wrapping half unfolds.
One half is rolled clockwise, the other one is
rolled counter-clockwise (looking from the midrib).
No. 3a, 3b, 3c is the problem. "Con" means
"together". In this case both halves are in the same roll, paralelly unfolding
in the same direction by contrast to the type 2. This is what I would call
convolute, I haven't observed this in aroids yet, however it is
----- Original Message -----
Sent: Friday, January 15, 2010 6:04
Subject: Re: [Aroid-l] Supervolute
vernation. Finally a photo!
I 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.
The 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 vernation?
You 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.
And 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.
shivering in south florida,
Wed, 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 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!
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.
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
My thanks to Leland for the photo!
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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