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  Heteroblasty--Peter Boyce.
From: <ju-bo at msn.com> on 2009.05.10 at 20:14:45(19314)
Dear all Aroidophyles,

A note to all who read this L, and a word of sincere thanks to Pete for this one!  I wonder how many of us stopped for just a moment to ponder (and be VERY thankful!!!) of how VERY fortunate we all are to have THE world experts at most or ALL families of Araceae, people such as Peter Boyce (Indonesia), Wilbert Hetterschied (Holland), Tom Croat (USA), Eduardo Goncalves (Brazil, Alistair Hay (Australia) and even Simon Mayo (UK) and this leaves out MANY other individuals who take the time from their busy schedules to answer querries made to this forum!
I know a little about Syngonium, but certainly did NOT know about this retention of one leaf-shape (Heteroblasty!) through the growth-cycle of this Syngonium species!
On behalf of the IAS, a heartfelt word of thanks to you guys/experts out there!
Now go ahead and join the IAS, we SO need your financial  support!!!  :--)

Julius Boos.

> From: phymatarum@googlemail.com



From: "Marek Argent" <abri1973 at wp.pl> on 2009.05.12 at 20:20:19(19318)
Hello Julius,

Not only Syngonium species are heteroblastic, you can observe it in many species of Philodendron and tuberous aroids where adult leaves are different from the juvenile ones.

For example see my Syngonium (I still don't know what species may it be, most people suggest this is a cultivar of S. podophyllum, but it can be also S. hoffmanni - its juvenile leaves are sagittate and white-veined, the adult ones are 3-lobed with 2 small posterior lobes ("ears"), but never they are 5 or more lobed like in a typical S. podophyllum)


Marek Argent



From: cgdz33a at aol.com on 2009.05.14 at 22:23:13(19323)
There are some great articles out there on Heteroblasty and Heterochrony in general. Anyone interested should have a look at some of Cynthia Jones' (UCONN) papers as well as James Grimes work on the Fabaceae.

Ive collected alot of data on morphology and heterochrony in the aroids over the past few years when I was considering aroid evolution for my doctoral thesis. It really is a great family with some model organisms for these studies. The seasonality and vining members of the family in particular provide some great data as Marek pointed out.

Eric C Morgan



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