Kathleen Eagle is best known for her contemporary romances and women's fiction set in the Indian Country of the Dakotas and Minnesota, but I recently learned that many years ago she wrote a few historical romances. I tracked down some of them, including Medicine Woman (1989). Set in the 1820's, it tells of a white American botanist who, in his explorations of the flora of the prairie, meets a Lakota woman who's been somewhat set apart from her tribe because of her dreams and visions.
It's a subtle, slow-blossoming romance, rich with Eagle's firsthand knowledge of Lakota culture and values. I enjoyed it.