Squash/cucumber/melon flower: male vs. female
How do you tell the difference?
Look at the stem of the flower. Male flowers will have a longer, skinny stem, but female flowers will have a tiny "fruit" at the base. These aren't actually a full fruit, and if not pollinated, they will drop off. In the case of summer squash, these are sometimes picked even before the flowers open and eaten petals and all.
Alison Stewart (aka Torquill)