Lesson CXXVI

The Yellow Lady’s Slipper

Leading thought—The moccasin flower belongs to that family of flowers known as orchids which especially depend upon insects for bringing and carrying pollen, and which have developed many strange devices to secure insect aid in pollenation.

Method—A bouquet of lady’s slippers should be brought to the schoolroom. Children who bring them should describe the place where they were found.

Observations—1. Where does the yellow lady’s slipper grow? Look carefully at its leaves and describe them. How do they join the stem? Are they opposite or alternate?

2. What is there peculiar about the sepals? How many are there?

3. Describe the three petals and the difference and likeness in their form and color. What is the shape of the lower petal? Is there a hole in this sac? Is there more than one hole leading into it? What is the color of the sac? Is there anything about it to attract insects? If an insect should enter the mouth of the well in the lower petal could it easily come out by the same opening? Why not? Where do you think it would emerge?

4. Note the two roundish objects projecting into the two openings of the sac near the stem. Thrust a pencil against the under side of one of these. What happens? How does this pollen differ from the pollen of ordinary flowers?

5. Cut away one side of the petal-sac and find the stigma. What shape is it? Where is it situated with relation to the anthers? How is the stigma protected above? Where is the ovary, or seed-box?

6. Explain how a bee visiting these flowers, one after another, must carry the pollen from one to another and deposit it on the waiting stigmas.

7. How is the insect attracted? How is it trapped and made to do the work?

8. Look at the seed-capsule and describe it from the outside. Cut it across, and describe the arrangement of the seeds. How many sides of the seed-capsule open, to let loose the seeds?

9. How many species of lady’s slippers do you know? Do you know the pink, or stemless species? How does it differ from the yellow species in the following particulars: The shape of the sac; its color and markings; the length and shape of sepals; the number and position of the leaves?