Go for it. I did have a TB with black stems. Unfortunaly the flowers looked lik a rat's ass and the stem fell over. All the babies had these same characteristics, unfortunatly.
You may have better luck with your line.
From: thomas silvers <email@example.com>
Sent: Thu, May 20, 2010 4:21 pm
Subject: [iris-photos] HYB: Black stems
This one seedling (from 4 Iris aphylla 'Balascuta' X 'Honky Tonk Blues' and about a dozen of the reverse cross) is showing the dark stems of 'Balascuta'.
I'd hoped to combine the dark stems with the nice purple based foliage (PBF) of 'Honky Tonk Blues' and it has done that to a degree, but some of the non-dark-stem siblings have better _expression_ of PBF.
I'm trying pollen of 'American Sweetheart' (another strongly PBF iris) on this one right now.
Shooting for all purple foliage if it wasn't obvious ;0)