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
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.
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
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