What is the botanical name for the perennial bulbs commonly known as Canna?

The botanical name for Canna, commonly known as canna lilies, is indeed Canna x generalis. This designation refers to the hybrid species that encompasses various cultivars of cannas grown for their vibrant flowers and foliage. Cannas are known for their spectacular blooms and lush, broad leaves, making them a popular choice in ornamental gardening.

The other options refer to different plant species that serve distinct purposes in horticulture. Hamelia patens, commonly known as firebush, is valued for its wildlife appeal, especially its attraction to butterflies and hummingbirds. Tagetes lucida, or Mexican tarragon, is a species of marigold known for its culinary uses and aromatic properties. Cuphea micropetala, also known as the cigar plant, is noted for its unique tubular flowers that attract pollinators. Each of these species has its own characteristics and uses, but they do not relate to the cannas, thus reinforcing the accuracy of Canna x generalis as the correct designation for the perennial bulbs commonly recognized as Canna.