Plant Delights Nursery @|
Juniper Level Botanic Garden
9241 Sauls Road
Raleigh, North Carolina 27603 USA
Minimum Winter Temps 0-5 F
Maximum Summer Temps 95-105F
USDA Hardiness Zone 7b
phone 919 772-4794
fax 919 772-4752
"I consider every plant hardy until I have killed it myself...at least three
times" - Avent
[mailto:firstname.lastname@example.org] On Behalf Of James Waddick
Sent: Wednesday, July 07, 2010 3:04 PM
To: Discussion of aroids
Subject: Re: [Aroid-l] Sauromatum x Pinellia hybrid.... and others...
> I've posted images of the flower this spring, and the plant as it
>currently grows in comparison with both putative parents, Sauromatum
>venosum and Pinellia pedatisecta.
This is a fascinating topic. As you probably know both Sauromatum
venosum (aka Typhonium) has a chromosome number of 2N= 26.
This is the same for Pinellia pedatisecta and some (but not all ) others in
this genus ie 2N = 26
I realize that chromosome nos. of themselves has little meaning, but
suggests a likelier road to hybridization.
In your differentiation of these two species you did not mention
what seems the easiest and most consistent feature- petiole pattern. In
Sauromatum the petiole is more or less heavily brown spotted and blotched,
while Pinellia pedatisecta has no spots and is uniformly green. I have a
hard time keeping Sauromatum alive outdoors in the ground, but somehow
tubers pop up in pots as do Pinellia. The petiole pattern is always a dead
give away even on small plants.
I didn't find your pix of the hybrid flower, but I'll search some
more unless you have a handy url.
In this same discussion, the cv "Indian Giant' is brought to mind.
This is a much larger form of S. venosum. Could it be a tetraploid? Has
anyone compared chromosome numbers to the typical, smaller form? And is
this, by the way, any more or less hardier than the typical form?
And even a bit father afield are the 2 species Dracunculus vulgaris
and Helicodiceros m. The former is found in the western Mediterranean
islands and has a 2N= 28. The latter is found in the Eastern Medterranean
with 2n = 56. Apparently there's no place where both occur in nature.
Is Helicodiceros derived from a tetraploid ancestor of Dracunculus
vulgaris or do they both share a diploid, and at one time more wide spread,
ancestor? More importantly can they be hybridized to produce a triploid F1?
Growing these species in close proximity as you do encourages bee
produced hybrids to form. I really enjoy your exploring this here. More as I
give it more thought.
Best Jim W.
Dr. James W. Waddick
8871 NW Brostrom Rd.
Kansas City Missouri 64152-2711
Zone 5 Record low -23F
Summer 100F +
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