Nectary n. : That part of a blossom which secretes nectar, usually the base of the corolla or petals; also, the spur of such flowers as the larkspur and columbine, whether nectariferous or not. See the Illustration of Nasturtium.

Example:
What are nectaries? In what particular plant parts are these structures located? What are their functions?

Taxonomy
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Defination from the web:
Nectary) Jump to: navigation, search. For other uses of "Nectar", see Nectar (disambiguation) ... It is produced either by the flowers, in which it attracts pollinating animals or by extrafloral nectaries, which provide a ...