The flower is a mutant plant of Norma Deathman.
It is a small carnivorous flower with sharp teeth.
It first tried to attack Scooby-Doo, but he calmed it down and it kissed him.
The New Scooby-Doo Mysteries
When Scooby got a cup of flour, a terrifying carnivorous plant came out and it attempted to bite Scooby. Scooby said "Nice, flower." The flower became happy and it kissed Scooby. (Scooby's Peep-Hole Pandemonium)