Monoecious – standard cucumber, which has a pretty even mix of male and female flowers on the same plant that are pollinated.

Gynoecious – cucumber with more female flowers (equaling increased yields). This can range anywhere from 70% female flowers to 100% female flowers. So regardless of whether it is "mostly" or "entirely" female flowers, it will need a monoecious variety next to it with the male flowers for pollination.

Parthenocarpic – female vs. male flowers don’t matter here because these will produce fruit without any pollination. Due to this, they can be grown in the greenhouse. These are almost always the long, “seedless” English or Asian types.