The suffix $-inae$ denotes which taxonomic category?

In botanical nomenclature of plants:

Plant families like $Convolvulaceae$ and $Solanaceae$ are included in the order $Polymoniales$ mainly based on their . . . . . . characters.

What is meant by botanical nomenclature?

In a taxonomic hierarchy,the number of common characters will increase as we go from

Identify the correct sequence of taxonomic categories from Kingdom to Species.