Sonja

https://commons.wikimedia.org/wiki/File:Euphorbia_cyparissias_(1).jpg

Dont think this one is a hybrid, at least nodody says so. They say it is only going red after loosing the seeds. Anyway, on river embankments and well grown in curbside gravel I have seen intensely blushed ones very often. They all start in lemony colours but if there is not a lot of moisture later on they tend to go bright red shortly before they call it a season -- only that they call it a season long before any tree tuns.

Hmmm, perhats then it is technically not a flower any more, comes to think of it although it looks the part and is prettiest in the red phase.