What is the botanical name for the perennial bulb Montbretia?

The correct answer is based on the classification of Montbretia, which is scientifically recognized as Crocosmia pottsii. This plant belongs to the iris family and is known for its striking, colorful flowers that typically bloom in late summer. Its perennial nature allows it to return year after year, making it a favorite among many gardeners.

The other options pertain to different plants entirely. Rudbeckia hirta is commonly known as black-eyed Susan, a member of the Asteraceae family, known for its vibrant yellow flowers. Allium giganteum refers to giant onion, which is noted for its large, round flower heads, and Hemerocallis fulva, known as daylily, produces blooms that last only one day but are prolific over the growing season. Each of these choices belongs to a distinct genus and serves different aesthetic or functional purposes in horticulture, distinctly differentiating them from Montbretia.