THE HERBARIUM TECHNIQUE

THE HERBARIUM TECHNIQUE

1. 1. BACKGROUND INFORMATION

According to Clamberland (1994), herbarium can simply be defined as a collection of dried, preserved and pressed plant specimens which are arranged systematically, serving as a taxonomic refernce of plants for their identification and classification. He further defines it as a repository of preserved and labeled plant specimen to allow easy access and achival storage. The herbarium is useful for research issdentification of plants and for comparison of materials with precious collection. It is also a growing source of knowledge about th vegetation of an area. Its effectiveness and value depend on the care with which the specimens are preserved, mounted, completeness of identification, labeling, satisfactory arrangement and maintenance of the collection.

          Dried and mounted specimen are stored in cabinets with tiht fitting doors. The storage cabinets is provided with partitions in which the families of plants may be arranged in alphabetical order or (more usually) in some presumed phylogenetic order. The specimens are typically in form of herbarium sheets, pressed and dried plants have been glued to a sheet of heavy paper, together with a labeled data. The label describes information which include the plants Latin names, the origin of the collections, the date of  collection, and the name of the collector. Within the cabinet the specimens are arranged according to the family, genus and species they represent as well as the geographic location from which they were collected.

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