The Bougainvillea is a genus of thorny ornamental vines, bushes, or trees. The inflorescence of Bougainvillea usually consists of three simple waxy flowers, surrounded by large colorful sepal-like bracts. The abundant color and comparatively long flower season makes the Bougainvillea one of the popular elements in road landscape construction around the world. Unfortunately, up-to-date, no Bougainvillea genome are available in public, which largely slows down the pace of mechanistic understanding of Bougainvillea and subsequent applications in practice. Here, we present a sequence library of all expressed transcripts derived from integrating heterogeneous RNA-seq datasets. This transcript library exhibits remarkable capability in reliable molecular and –omics research, serving as an alternative reference to the gnome. It will be particularly useful for systematic and dynamic exploration of gene function under the circumstance of no genome.