Perfect

The exact idea of being perfect or imperfect varies somewhat between plants and fungi.

All fungi in the division Deuteromycota cannot undergo any form of sexual reproduction.

All nonflowering seed plants are imperfect in relation some angiosperms. This is because their reproductive organs are either male or female. This does not mean one single plant would have both seed and pollen cones. So gymnosperms[?] are either dioecious or monoecious but never both.

A flower is perfect if it has both male and female parts. That is, it has both filaments[?], anthers, stamens and a style[?], ovary and ovule[?]. This makes a flower perfect. If a plant has separate male and female flowers, it is dioecious. If the plants have male or female flowers on separate individuals, it's monoecious.