I'm trying to determine a plant of the genus Ononis, but the documents I use lead me to confusion. It could be Ononis tournefortii, but the keys of "Flora Ibérica" and “Flora Vascular de Andalucía Occidental” indicate that this species has the estardarte and yellow keel, while a previous article, “El género Ononis L. y las Ononis españolas”(Anales del Jardín Botánico 16(1): 227-337), do not indicate this character as a determinant, and are common in internet pictures of this taxon with pink flowers. Ononis tournefortii always has yellow flower?