Assertion: sweet flag's number | /r/HasProperty | taken into account
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Source sentences:
text: (However, when number of flowers per floral unit, flower abundance, and phenology were taken into account it dropped out of the top 10 for most nectar per unit cover per year, as did all plants that placed in the top ten along with this one for per day nectar production per flower, with the exception of common comfrey, Symphytum officinale.