Genus of plants with colourful flowers such as the Argentinian Vervain and American Blue Vervain (7)

I believe the answer is:

verbena

(Other definitions for verbena that I've seen before include "Ornamental plant with showy flowers" , "Garden plant" , "Ornamental pant" , "Vervain (plant)" , "Herbaceous plant" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.