A papilionaceous flower is known by which set of features

The collective term for the sepals of a flower is the calyx.

The ICN sets the starting point for the priority of binomial nomenclature to Linnaeus’ work Species Plantarum, which was published in 1753.

Decurrent means different things in different places.  When referring to leaves, decurrent means the leaf is adnate to the stem.

All cycads are wind-pollinated.

The Asclepiads, now in Apocynaceae, are known for insect pollination, for which they mimic the appearance and smells of dead and other unattractive things.

The dicots are a paraphyletic group, which forced the APG to create new groups called the eudicots and magnoliid dicots.

Which term does not match the other three:

A flower with separate carpels is called:

Which order of leaf apices below progresses from the narrowest to the widest: