From: aroid-l-bounces@gizmoworks.com
[mailto:aroid-l-bounces@gizmoworks.com] On Behalf Of Marek
Argent
Sent: Sunday, March 07, 2010 2:47 PM
To: Discussion
of aroids
Subject: Re: [Aroid-l] Dieffenbachia hoffmannii
photo?
Hello,
There is a wrong photo in the
database:
href="http://www.tropicos.org/Name/2106342">http://www.tropicos.org/Name/2106342
This is Aglaonema commutatum, not
Dieffenbachia.
To Anyone signed up in the MoBot: please report the
error.
Best,
Marek Argent
----- Original Message -----
From:
href="mailto:Steve@ExoticRainforest.com">ExoticRainforest
To:
href="mailto:aroid-l@gizmoworks.com">Discussion of aroids
Sent: Thursday, March 04, 2010 2:49
PM
Subject: Re: [Aroid-l] Dieffenbachia
hoffmannii photo?
The photo in Graf's material is
very similar to Dieffenbachia seguine (Jacq.)
Schott. That species has a ton of synonym names but since" hoffmanii" is
not a legitimate name it isn't in the list. As I stated earlier, Mr.
Graf's books are a good photo source but Dr. Croat has pointed out in several
personal conversations his photos are often improperly captioned.
I
would suggest you go to the link below, check the photo, then click on
"specimens" at the top of the page. Scroll down to any that were
collected by Dr. Croat, scroll over to the right of the page and click on his
collection number. There you will find where he collected it along with
his field notes. Frequently there is enough material there to make a
good ID of a plant, just read as many of Tom's notes as
possible.
class=moz-txt-link-freetext
href="http://www.tropicos.org/Name/2106342">http://www.tropicos.org/Name/2106342
However,
like all aroids this species can be variable. If you click on the
synonyms on the first page you'll find a long list of additional names (now
invalid) granted to this species. My guess is you likely have a synonym
of this species. Although your plant is far too old to be one of the
recent tissue cultures there are many variations being created in tissue
culture of this species that can be bought at many stores.
I believe the species is in Dr. Croat's
Revision of Dieffenbachia (Araceae) of Mexico,
Central America, and the West Indies but I don't have a
copy. If you have access to JSTOR I suggest you
check out that source.
For those
on Aroid l not familiar with natural variability this link may be
useful. The article addresses why many of us have trouble learning what
species we are growing. I recently rewrote the entire page and added a
bunch of photos to illustrate how extreme variability can be in aroid
species. I've already asked several well known aroiders to read the info
and so far only one objection has come back to one particular section. I
addressed that and feel relatively confident the material is scientifically
accurate.
If any of you with a strong background in botany find
an error I will quickly address the problem:
class=moz-txt-link-freetext
href="http://www.exoticrainforest.com/Natural%20variation%20within%20aroid%20and%20%20plant%20species.html">http://www.exoticrainforest.com/Natural%20variation%20within%20aroid%20and%20%20plant%20species.html
Steve
class=moz-txt-link-abbreviated
href="http://www.ExoticRainforest.com">www.ExoticRainforest.com
On 3/2/2010 08:10,
Carol McCarthy wrote:
Hello Steve, John, Conrad and anyone else reading along,
I checked my database yesterday, I got the
name from the same source John quotes; A.B. Graph's Exotica; page 172
of Edition 9 to be more exact. I will also note that the plant
has been in one of two university greenhouse here at WVU for at least 15
years. From what I know of the collections, I do not believe that this
material was collected straight from habitat even back then. Whether
it was bought, traded for or a gift I do not have any records to enlighten
me. The two professors who might know are both long retired.
We have been doing an inventory update of the
greenhouse collections and working on correcting and updating questionable
names along the way. I guess for now, this one will stay
questionable.
This Dieffenbachia grows very slowly and has a
different, deeper green than most. As the picture John attached shows
a little, the petioles show stripes and or dots of lighter colors on the
deep green ground color. Currently the plant is at another greenhouse
across campus, I will try to get a picture of this plant, whatever it
is, in the near future and post it. Since we have established
that D. hoffmannii is not a valid name does anyone have any suggestions as
to a correct identity?
Thanks to a great group for any help at
all.
Carol.
Carol McCarthy
Greenhouse Manager
Biology Department
West Virginia
University
PO Box 6057
53 Campus Drive
Morgantown, WV 26506
304-293-5201 ext
31477
>>> "John"
href="mailto:criswick@spiceisle.com">
3/1/2010 2:19 PM >>>
I cannot give a
source for the name Dieffenbachia hoffmannii but I have in the 60s and 70s
grown this Dieffenbachia, in fact it was a favourite of mine. The name
is no longer valid, if it ever was, but D. ‘Exotica’ or ‘arvida’ may
be a mutation of it, whatever it is. Both are said by Graf to be from
Costa
Rica.
The accompanying
illustration may perhaps answer questions about markings on stem and
petiole.
John.
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