Re: [Aroid-l] Sauromatum x Pinellia hybrid.... and others...

From: James Waddick <jwaddick at kc.rr.com> on 2010.07.07 at 19:03:55(21162) > 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. > >http://www.plantdelights.com/gallery/Aroids/Copy_of_Sauromatum_x_pinellia_in_bud Dear Tony 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. +More 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 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F + _______________________________________________ Aroid-L mailing list Aroid-L@www.gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

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