Collector's name &
collection field number

To avoid mixing and confusing collection details, specimens are usually identified by a sequence field numbers that link specimens with their field notes.

Specimens are usually referred to by a combination of the collectors name and number, e.g Jones 4567

Some collections, especially older ones have collectors names, but no numbers; a few have neither collector name nor number.

The combination of collectors name and number is not unique for all collectors, or in some instances even for a single collector, so in most case another unique accesion number is added to the specimen when it is incorporated into the herbarium.