Asclepias curassavica. One flower with the gynostegium in longitudinal section. Note the gland (corpusculum) and pollinia in the upper left. The corolla tube has been dissected to show the 2 free, superior ovaries, while the top of the gynoecium is connate and then adnate to the androecium to form part of the gynostegium.
Photo by K. R. Robertson and D. L. Nickrent from plants cultivated at the University of Illinois.