Folk taxonomy was researched with the use of informant interviews, researcher observations, and comparison of farmers’ recognized taxa with formal taxonomy. Folk ranks and taxa were recorded according to the universal scheme proposed by Berlin et al. [26] and Berlin [31]. Accordingly, there are at least five, perhaps six, ethnobiological folk categories which appear to be highly general if not universal in folk biological science. Applying the basic principles proposed by the preceding authors, the categories can be reduced into a set of four general nomenclatural orders as follows:

Farmers were asked to free list generic names to all kinds of yams they knew at and above species level. Taxa satisfying these conditions are generic; their labels are generic names.

A category called intermediate taxa included the fact that farmers recognized supra-variety categories that are labeled by names. Taxa satisfying these conditions are sub-generic (specific); their labels are supra-variety names.

Farmers were asked to free list the names of individual taxa that they perceive as a distinct unit. Taxa satisfying these conditions are varietal; their labels are variety names.

Some taxa are marked only by binary lexemes, containing further divisions of a variety. Taxa satisfying these conditions are sub-varietal; their labels are sub-variety names.

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