What is the shrub with clusters of bright yellow blooms that we see flowering now?

We usually refer to this shrub as Cassia (Cassia bicapsularis ). Cassia is a good choice for full sun locations when planted where it will not be missed in the winter when the frost kills it to the ground. Cassia usually sprouts out again in the spring and will often grow as high as 15 feet before winter. Cassia rewards us with bright golden yellow blooms that remind us of butterflies each fall.