Attached is a photo of a clipping that I took from a shrubby plant growing in a pot here in San Miguel de Allende, Mexico. I took some cuttings from the stems which had grown to a height of 3 to 4 feet. The leaves are singularly spaced at about 4 to 6 " intervals. The stems secrete a white liquid when cut. They almost look like cane begonia stems. The photos show the flowers that top each long stem.
Resin Northumberland, United Kingdom(Zone 9a) Nov 17, 2012
Euphorbia of some sort.
Watch out for that white liquid, can cause nasty skin burns.