Thanks for the excellent article...I read a whole book about dogwoods a few years ago, but got a better understanding of the different species and cultivars from your article.
I have several of the the elegantissima and flaviramea planted around a dry creek bed, but I'm thinking that I'd like bright red stems and better fall color instead. I don't want them to spread into thickets, though...any suggestions? Don't some spread and others not?
C. 'Midwinter Fire' is said to spread so much as to be a nuisance (although I have not seen this). C. 'Siberica' is an excellent red stemmed form and keeps to itself. They are all easily kept in check, however, and all benefit from being pruned down regularly.