A Punched Card Key to Species of Trifolium L.In Africa South Of the Sahara Excluding Ethiopia

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Date
1966
Authors
Mannetje L.
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Abstract
The simple5lt and quickest way to identify plants is by the use of punched cards. Dichotomous keys presuppose complete specimens which are not always available, and numerical keys. as suggested by Osborne (1963), require the user to work out a numerical description of the specimen. A punched card key, consisting of a deck of cards, each card representing a species, subspecies, or variety, can be used wi,thout having to study all the characters of the specimen, and identification is often possible even if the specimen is not complete. Characters may be used in any order and mistakes in identification are minimized by sort,ing on the most obvious characters first. Species or varieties can be added or excluded without changing the key.
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East African Agricultural And Forestry Journal, XXXI (3), p. 261-278