> the casual way the sampling was undertaken has me gun-shy to say too much with any sense of certainty.

Well, certainty is not one of applied science's strong points. I offer this quote from Dr. Vaughan Bryant

When using pollen counts to
determine the nectar sources of a
honey sample, we recognize that
the types and percentages of recovered
pollen do not provide a
one-to-one correlation with the
true nectar sources in the honey.
Nevertheless, it is still the fastest,
least expensive and most common
method of determining the
origin of nectar contents in honey.

Jones, G. D., & Bryant, V. M. (2014). Pollen studies. Palynology, 38(2).

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