Cucurbits are monoecious; there are separate male and female blossoms on the same plant. The male flowers tend to open first, followed by the female flowers. It is only when both the male and female flowers are open that pollination can occur.
There is nowhere in the Constitution that says that the Congress can subpoena the President of the U.S. or his people. Congress does however have general subpoena powers, but they are not absolutely clear. There are Supreme Court cases that speak to this. They generally limit this to national security type of issues.
A subpoena is a command issued by a court obligating a person within its jurisdiction to appear at a certain time and place for the purpose of providing evidence in a pending matter. A subpoena ad testificandum compels a witness to appear and give testimony. A subpoena duces tecum compels a witness to appear, produce records or tangible items, and give testimony. Download PDF