Monoecious plants have both male and female reproductive structures on the same plant.
Pinus, a gymnosperm, is monoecious because it produces male and female cones on the same tree.
Other options:
Papaya: Dioecious, with male and female flowers on separate plants.
Marchantia: Dioecious, with separate male and female thalli.
Cycas: Dioecious, with male and female cones on different plants.