Fig. 461.
A group of jacks.
857. Cypripedium, or lady-slipper.—One species of the lady-slipper is shown in [fig. 468]. The labellum in this genus is shaped like a shoe, as one can see by the section of the flower in [fig. 468]. The stigma is situated at st, while the anther is situated at a, upon the style. The insect enters about the middle of the boat-shaped labellum. In going out it passes up and out at the end near the flower stalk. In doing this it passes the stigma first and the anther last, rubbing against both. The pollen caught on the head of the insect, will not touch the stigma of the same flower, but will be in position to come in contact with the stigma of the next flower visited.
Fig. 462.
Proterandry in the bell-flower (campanula). Left figure shows the syngenœcious stamens surrounding the immature style and stigma. Middle figure shows the immature stigma being pushed through the tube and brushing out the pollen; while in the right-hand figure, after the pollen has disappeared, the lobes of the stigma open out to receive pollen from another flower.
858. Epipactis.—In epipactis, shown in [fig. 469], the action is similar to that of the blue iris.
Fig. 463.
Kalmia latifolia, showing position of anthers before insect visits, and at the right the scattering of the pollen when disturbed by insects. Middle figure section of flower.