It seems like that would be good evidence that Murrayana is a
virginica. Crossing white versicolor to regular versicolor should just
result in regular versicolor, but crossing white virginica to regular
versicolor would give regular ×robusta, which is indeed "taller than
either parent and often with purplish spring growth."
Sean Z
Quoting Dennis Kramb <d*@badbear.com>:
> Wow! I found an awesome article by Todd Boland on Murrayana. Here's an
> enticing excerpt...
>
> "I crossed 'Murrayana' to our native /I. versicolor /and other named
> selections of /I. versicolor/. The offspring end up looking like regular
> /I. versicolor/ but are extremely vigorous... much taller than either
> parent and often with purplish spring growth."
>
> Todd are you still a member here?
>
> Oh, here's the link... http://davesgarden.com/guides/articles/view/2674/
>
>
