Abstract
A herbarium is a collection of pressed, dried plants that have been identified, mounted, and labeled (Figure 1). Mothballs are placed with the specimens to prevent damage by insects. The plants are kept indoors, free from excess moisture and extreme temperatures. Specimens stored in herbaria [plural] can remain useful for many years. Even features of cellular anatomy such as epidermal guard cells can be studied successfully from preserved plants. Herbarium collections are found at many college and university botany departments, large museums, and botanic gardens. Some fine personal herbaria are also maintained by individuals who have built their own collections and have stored them in their homes or offices.