Flower structures of Incarvillea mairei and pollinator behavior. (A) Rocky meadow habitat of population GML. (B) Mature flower. (C)The large, bilobed sensitive stigma and four anthers. (D) Longitudinal section of flower. (E) Anther appendages (attached oppositely to each lobe). (F) Opened stigma. (G) Closed Stigma. (H) Halictid bee touching the stigma. (I) Halictid bee is pressing the anther-thorns (arrow indicating released pollen). (J) Halictid bee exiting flower. (K) After bee has exited, the stigma remained closed. a.i: inner anther; a.o: outer anther; t.o: outer anther-thorn; t.i: inner anther-thorn; s: slit in anther-lobe; p: pad.