Lesson CXLIII

The Dandelion

Leading thought—The dandelions flourish despite our determined efforts to exterminate them. Let us study the way in which they conquer.

Method—The study should be made with the dandelions on the school grounds. Questions should be given, a few at a time, and then let the pupils consult the dandelions as to the answers.

The dandelion is a composite flower and may be studied according to Lesson CXXXV. All the florets have banners or rays.

Observations—1. Where do you find dandelions growing? If they are on the lawn, how long are their blossom or seed stems? If in a meadow or among high grass, how long is the blossom stem? Why is this? Is the blossom stem solid or hollow? Does it break easily?

2. Dig up a dandelion root and then explain why this weed withstands drought, and why it remains, when once planted.

3. Sketch or describe a dandelion leaf. Why was the plant named “lion’s teeth?” How are the leaves arranged about the root? How does this help the dandelion and hinder other plants? In what condition do the leaves pass the winter under the snow? Why is this useful to the plant?

4. Take a blossom not yet open. Note the bracts that cover the unopened flower-head. Note the ones below and describe them.

5. Note the dandelion flower-head just open. Which flowers open first? How do the buds look at the center? Do all the florets have banners? Are the banners of the central florets the same color and length as of those outside? Examine a floret and note the young seed. Is the pappus attached to it or above it?

6. What happens to the dandelion blossom on rainy or dark days? How is the dandelion family hidden during the rain? When does it appear again? Do you think that this has anything to do with the insect visitors? Do bees and other insects gather nectar during dark or rainy days?

7. Note at what hour the dandelions on the lawn go to sleep and at what hour they awaken on pleasant days?

8. Make notes on a certain dandelion plant three times a day: How long does it take the dandelion head to open fully on a sunny morning? How long does it remain open? How long does it take the flower-head to close? What proportion of the flowers in the head, blossoms during the first day? What proportion of the flowers in the head, blossoms during the second day? How long before they all blossom? Does the flower-head remain open longer in the afternoon on some days than on others, equally sunny? Does the stem bend over before the blossom-head opens?

9. After all the little flowers of a dandelion family have blossomed, what happens to it? How long does it stay shut up in its house? Measure the stem, and see if it stretches up during the time. How does the dandelion look when it opens again? Look at a dandelion-head full of seed, and see how the seeds are arranged to make a perfect globe. Shake the seeds off and examine the “bald head” with a lens. Can you see where the seeds were set?

10. Examine a dandelion seed with a lens. Describe the balloon, the beak or stem of the balloon, and the seed. Why do you suppose the seed has these hooks?

11. How early in the spring, and how late in the fall, do dandelions blossom?

12. Watch a bee when she is working on a dandelion flower, and see where she thrusts her tongue and which flowers she probes.

13. Tell all the things that you can remember which the dandelion does in order to live and thrive in spite of us.

14. What use do we make of the dandelions?