Mutations, Variations and Relationships of the Oenotheras is a book written by D.T. Macdougal in 1907. The book is a comprehensive study of the Oenothera plant species and their variations, mutations, and relationships. The Oenothera plant, also known as the evening primrose, is a genus of flowering plants that are native to North and South America. The book is divided into several chapters, each of which focuses on a specific aspect of the Oenothera...