What are the pollination methods (self-pollination and cross-pollination) of rose, milkweed, okra, henna, Lagerstroemia indica and palm respectively?

Milk grass is suspected to be a hybrid flower.

Each flower of okra lasts only one day. The structural feature of the flower is that although the pistils and stamens are integrated, the stigmas of five pistils are pushed forward by the style and bent upward. In this way, it is difficult for stamen pollen to spread to the stigma of dioecious pistils at the best pollination time of the day when there are few natural wind and insect vectors such as bees and butterflies. However, self-pollination has a certain sterility mechanism, so it is difficult to complete pollination and the natural seed setting rate is extremely low.

Henna is self-pollinated (a few plants in nature are self-pollinated, such as barley, wheat, soybeans, beans, rice, henna, etc.). )

Lagerstroemia speciosa

Palm doesn't know whether it is self-flowering or cross-flowering, but it is wind-born.

This is all we know. . . .