Within varieties, flower type is usually identified by flower size and shape. Female flowers are relatively large and rounded at the base. They have a stigma but lack stamens. They generally must receive pollen in order to set fruit. Pollen can be carried by wind or by insects.
Male flowers are thin and tubular.
Hermaphrodite flowers are intermediate between female and male flowers in size and shape. They are less bulbous than female flowers, but not as thin as male flowers. They have perfect structure with functional stigma and stamens and usually are self-pollinating. Female plants always produce female flowers. If no male or hermaphrodite plants are nearby to provide pollen, female plants usually fail to set fruit.