In informal English, I often see the phrase "some variety of" referring to a singular classification of a particular object of a sentence. For example:
That appears to be some variety of plant.
This class is just some variety of higher-level type.
Due to the boundedness of variety as referring to "a number or collection of different things, especially of a particular class," is this necessarily incorrect usage? Despite the numerous distinctions in the English language between an object's singular and plural forms, this might indeed be the case, but by that same token, the phrase can be easily satisfied by substituting a size of one for the number or size of the collection. This satisfies the definition, despite the further qualifier "of different things," in which it can be logically inferred that the single term differs from nothing at all.
I'm clearly over-thinking this, and the phrase is regardless vague and non-specific, but I'm more curious if it's correct according to the current, formal revision of the English language.