A more accurate way to phrase the question would be, "Which plants have unisexual flowers?" Unisexual flowers are those that are either male (staminate) or female (pistillate), but not both in the same flower. Several plants produce only unisexual flowers. Here are some examples:
- Coconut flowers: Coconuts have both male and female flowers on the same plant (monoecious), but each individual flower is either male or female.
- Papaya: Papaya plants can be male, female, or hermaphroditic (having both male and female flower parts in the same flower, which is not unisexual). However, the male and female plants will only have unisexual flowers.
- Watermelon: Watermelons produce separate male and female flowers on the same vine (monoecious).
- Cucumber: Similar to watermelons, cucumbers have separate male and female flowers on the same plant.
- Maize (Corn): Maize has separate male (tassel) and female (ear) flowers on the same plant.
- Other Examples: White mulberry, musk melon, castor bean, marrow, luffa, snake gourd, bitter gourd, tapioca, pumpkin, American holly, birch, pine, gopher purge, and tungoil bean also bear unisexual flowers.
It is important to note that the term "unisex flower" is somewhat misleading. It refers to a flower that is either male or female, as opposed to a "perfect" or "bisexual" flower that contains both male and female reproductive parts. Therefore, the best answer is a list of plants that produce flowers of only one sex.
