That table is extremely helpful, thanks! Hadn't been able to find a tutorial/info that documented all the different types in one place. That rocks that this is all supported.
I see now I was mixing up adjacent and child selectors. If anyone reads this and needs an answer, I should have been using this for my blockquotes (which were nested):
Code:
blockquote > blockquote {padding-left: 20%}
The 'p.initial + p' didn't work because of my workflow - I forgot the <p> tag and initial class hadn't created yet because I'd been using markdown.