the stamens, the male reproductive organ in a flower, have an apex below the opening, or mouth, of the corolla tube. they are, therefore, inserted at 0.16 to 0.2 of the length of the corolla tube. that measures at from the base. the anthers are by . the anthers have stiff hairs at the base of the connective, the sterile part between just below where they occur with the pistil head.