Educate me on one of the finer points of botany, please (Brussels sprouts)

[Colibri]

@Senegoid

Brussels sprouts, you might note, somewhat resemble miniature cabbages, and I believe are are in fact related.

Same species, actually.

The cabbage Brassica oleracea has a very large number of distinct cultivars. Cabbage, Brussels sprouts, broccoli, kale, collard greens, cauliflower, and kohlrabi all belong to the same botanical species.