The term 'bulbous perennial' refers to a type of plant that has a bulb-like structure and is able to survive for more than two years. The crossword solution for this term is 'SEGO', which is the common name for the plant Calochortus nuttallii, a species of wildflower native to western North America. It is known for its showy, cup-shaped flowers that come in a variety of colors, including white, yellow, and purple.