Herbarium specimens are preserved plant specimens that have been collected, dried, and mounted on sheets of paper for scientific study and reference. These specimens are typically stored in herbaria, which are specialized collections used by botanists and other scientists to document and study plant biodiversity. Herbarium specimens are valuable resources for taxonomic research, ecology studies, conservation efforts, and more. They provide a physical record of plant species, their distribution, morphology, and other important characteristics, making them an essential tool for understanding and documenting the diversity of plant life on Earth.