PlantFiles: Ceylon Senna, Red Cassia
Cassia roxburghii

This plant is known to grow in zone 9B Sarasota, Florida. The flowers are somewhat smaller than many of the well known cassias like fistula, but still larger than a quarter. Though sometimes this is described as a shower tree, it does not make flowers in chains like the fistula or rainbow showers. Flower is a dark pink, so considered red. This tree is found in many nurseries in the Sarasota area.

This plant is sometimes called a marginata. I am not convinced this is the same plant, as pictures of marginata and roxburghii look very different. I have had success starting marginata from seed. It is typically described as a shorter tree than this listing for roxburghii