. . it's broccoli that just looks like a cauliflower. Orange is a cross between regular cauliflower and a mutant found in a swamp in Canada. Plant geneticists are not yet sure what the green broccoflower is or where it came from - but it's certainly not a cross between broccoli and cauliflower - they're sexually incompatible.

Brocciflower (note the "i" instead of "o" is a frankenveg, a genetically engineered cross between broccoli and cauliflower - but it's very rarely seen today.