Having two distinct whorls of perianth parts (both calyx and corolla).

Having male and female reproductive organs maturing at different times to prevent self-fertilization.

The condition where male and female flowers on the same plant mature at different times.

Forking into two equal branches or divisions.

A division or forking into two equal or nearly equal parts.

The condition of having unisexual flowers (either male or female).

Having separate male and female flowers (unisexual flowers).

Dividing into two one-seeded segments at maturity (of fruits).

A flowering plant whose embryo typically has two cotyledons (seed leaves).

The class of angiosperms characterized by having two cotyledons in the seed.