Pyracantha is an ornamental shrub commonly grown for its colorful berries. There are several synonyms for this word, including firethorn, scarlet firethorn, and rostovianum. Firethorn is the most commonly used synonym and accurately describes the plant's thorny nature and bright, fiery berries. Scarlet firethorn refers to the intense red color of the berries and foliage, while rostovianum is a specific cultivar of pyracantha with larger berries and a more upright growth habit. Whether you call it pyracantha, firethorn, scarlet firethorn, or rostovianum, this shrub adds stunning color and texture to any garden or landscape.