"Enquiry into Plants" is a work by the ancient Greek philosopher and botanist Theophrastus. Written in the 4th century BCE, it serves as one of the earliest comprehensive studies of plant life. The text categorizes plants based on their characteristics, uses, and habitats, laying the groundwork for future botanical studies. The work is divided into several books, each focusing on different aspects of plants, such as their growth, reproduction, and medicinal properties. Theophrastus emphasizes the importance of observation and classification, influencing later scholars and contributing significantly to the field of botany.