The red flower name on Guangzhou overpass

It is called Le Du Fu, also known as Triangle Flower, and its scientific name is Jinbao.

Rhododendron has prickly stems and heart-shaped leaves. The triangle flower we usually see is actually not a flower, but a sepal. Its flowers are composed of three matchhead-sized buds gathered on the sepal midvein, and its style is deep red. Its flowers are pale yellow, even smaller than soybeans, so small that people mistakenly think that its sepals are its flowers. It always blooms in clusters. At close range, it seems that more than a dozen inseparable brothers are clustered together. From a distance, it looks like a fireball and is deeply loved by people.