It attached to the rose branch. There's green fruit of the size of a hand. See attched picture.
This post was edited by terrence123 on Tue, Oct 1, 13 at 20:08
Terence123 if you do not get an answer here then try the name that plant forum:http://forums2.gardenweb.com/forums/namegal/
I'm pretty sure it's a wild cucumber. Not sure of the actual name, but we get them here all the time! Serious weed. Get rid of it!
OR, it's a member of the nightshade family, and that is serious poison.
Either way, it's not good. It's choking your rose. Not edible!
I believe that might be Araujia sericifera, and it is considered a noxious weed in California.
Here is a link that might be useful: Calflora: Araujia sericifera