What kind of flower is Indigofera?

If Isatis indigotica and Malan are almost indistinguishable, then Isatis indigotica is iris, because many people call iris Malan, and iris is very similar to iris. But I also found another kind of flower in the search map. Let me check it again.

Blue flowers bloom-green corps, they use flowers that like flowers and plants.

There is another one, which I found out: the flowers, dried roots and rhizomes of Acanthaceae plants are called Isatis indigotica, also called Isatis indigotica. So I think the real blue flowers should be blue flowers.