Botanical name of cauliflower is
Brassica oleracea var. botrytis
Brassica oleracea is a plant species which includes cauliflower, cabbage, broccoli etc. belonging to family Brassicaceae. The botanical name of Cauliflower is Brassica oleracea var. botrytis. Cauliflower is an annual plant that reproduces by seed. The edible part is the head (florets) which is used as a vegetable. So, the correct answer is 'Brassica oleracea var. botrytis'.