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  Xanthosoma "roseum"
From: "Eduardo Goncalves" edggon at hotmail.com> on 2003.01.26 at 16:59:22(9887)
Dear Susan,

The only species that fits this description is Xanthosoma robustum, that
is, in my opinion, a synonim of Xanthosoma roseum. It ranges from Mexico to
Guatemala and probably even more to the south. It is widely available in
Florida as Xanthosoma sagittifolium ("malanga-blanca")!!!! In fact, I wasn?t
able to find a real Xanthosoma sagittifolium growing in Florida!!!

Very best wishes,

Eduardo.

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From: "brian williams" pugturd50 at hotmail.com> on 2003.01.27 at 15:25:56(9890)
Eduardo can you show a pic of a true Xanthosoma Sagittifolia? I would like
to see if I have one or what to be looking for. THANKS

_________________________________________________________________

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From: "Eduardo Goncalves" edggon at hotmail.com> on 2003.01.28 at 17:40:19(9894)
Dear Brian,

As I have said in a previous post, I will look for a picture in the web.
If I can?t find it, I will post a picture of mine.

Very best wishes,

Eduardo.

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From: snalice at cnmnetwork.com on 2003.01.29 at 02:37:45(9897)
Eduardo,

Thank you for that information. I appologize if no one is interested in this subject, but I appreciate the
help given.

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From: Tom Croat Thomas.Croat at mobot.org> on 2003.01.29 at 14:38:53(9901)
Dear Eduardo:

I have finally concluded that Xanthosoma robustum is widespread in
Mexico. I am treating it in my Flora del Bajia which is an area made up
partly of Colima, Guerrero and Michacan. It also ranges into Guatemala (and
probably all the way to Costa Rica according to Mike Grayum).
Are you saying that X. roseum is an older name and that it should take
precedence? We have material in our herbarium called X. roseum cultivated
in Hawaii which is not the same species (though I am uncertain of the
correctness of the determination).

Tom

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From: "Eduardo Goncalves" edggon at hotmail.com> on 2003.01.29 at 16:01:36(9902)
Dear Susan,

Well, I couldn?t access the other pictures (a weird error message
appeared) but the "Xanthosoma sagittifolium" you showed is also X. robustum!
Believe, Xanthosoma sagiitifolium (if it really cultivated in USA) is pretty
rare!!!! In Lorenzi?s book "The tropical plants of Burle-Marx" there are
both species featured and I checked the ID personally, but the angle of the
picture is not good enough to show exactly the differences.
Grayum?s statement on Flora of CR is very accurate, and I agree with him
in almost anything. However, based on my experience cultivating those
beasts, Xanthosoma sagittifolium will never turn into X. robustum, even when
you allow it to grow fully. I have started both species, side by side, at
the same juvenile state, and they get different with time. On the top of
this, young plants are different too!
Anyhow, I do believe that Xanthosoma sagittifolium is a domesticated
"species" and it is possible that the original stock were gathered from
something within same evolutionary lineage of modern X. robustum. It seems
to have been selected from some neotenic individuals of the X. robustum
complex, because young specimens keep their starch-rich cormels instead of
the spongy adult stem. Even today, only young individuals of X. robustum
(malanga blanca) are harvested as food.
I have an article on cultivated Xanthosoma that I am preparing to be
published in Aroideana, with pictures of most cultivated species. I am
planning to release it this year, so I think a few things will get clear.

Very best wishes,

Eduardo.

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From: "Julius Boos" ju-bo at msn.com> on 2003.01.29 at 16:18:37(9903)
Dear Friends,

Just a word and a quick note which I feel sure Eduardo will confirm re: the
cultivated Xanthosomas---CONFUSION.
At the moment here in S. Florida there are several Xanthosoma vars. being
sold as food CHEAP and by the lb. at Winn Dixie, Publix, and other food
stores. There is the 'white' Xanthosoma grown in Miami, dear to us
Trinidadians heart because of its special texture when cooked. Then there
is another labled as coming from Costa Rica that had brownish 'scales'
covering the growing tip that has a SLIGHT lilac 'tint' at the base of the
scales. Then there is the 'red co co' sold mainly in Jamaican stores at a
substantially higher price. Then there is the rarer yellow-fleshed one
sold in Hispanic stores, said to be a 'special' one used seasonally.
In an attempt to TRY to clear up some of the confusion surrounding these
plants, I am starting to buy and cultivate the different ones, my hope is to
grow them to flowering and photograph the blooms, tubers, etc. to assist
Eduardo in his research on this problematic group. There are also number
of Colocasia var. tubers sold in some stores, the eddoes, and many (at least
three) vars. of dasheen or taro.
Meanwhile I suggest that we all ignore all these older publications like the
one quoted by our Susan (below) which vary a LOT in what they say, and all
or most freely admit that they know not what they say, adding to the
confusion! All the ones I mention above make BEAUTIFUL plants, so just
grow and enjoy until someone like Eduardo can put names to this mish-mash of
plants grown as food!
Susan, there is a LOT of interest in these plants! Note that the Mayan
word for Xanthosoma is written as 'tiquisque', but I have also seen it
written and also pronounced 'qi-ques-qe', so even this is not stable.

Good Growing!

Julius

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From: "Eduardo Goncalves" edggon at hotmail.com> on 2003.01.30 at 09:17:07(9904)
Dear Tom,

Yes, X. robustum is the only big Xanthosoma widespread in Mexico. I have
seen it from Mexico City to Chiapas and probably it ranges down to Costa
Rica. Xanthosoma roseum is not the older name. Xanthosoma robustum were
described in 1853, whereas X. roseum was described in 1858. I am treating
them as synonims, since the stated differences between them are within the
variation range of X. robustum. Many species were determined as X. roseum,
only because they have a pinkish spathe or a pinkish sterile portion of
spadix. The feature is known for X. robustum, X. blandum, X. mafaffa and X.
sagittifolia, so it is not a good diagnostic feature.

Very best wishes,

Eduardo.

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From: Tom Croat Thomas.Croat at mobot.org> on 2003.01.31 at 12:16:44(9908)
Dear Eduardo: I agree that X. roseum is likely to be a synonym. It will be
good to get rid of the name. Frankly I have never seen a spathe that was
pinkish in any Xanthosoma, certainly not at anthesis but the sterile male
flowers of X. robustum are often pinkish.

Tom

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