Lesson CXVIII

Adder’s Tongue, or Dog-tooth Violet

Leading thought—The adder’s tongue is a lily, and its mottled leaves appear early in the spring, each pair coming from a corm deep in the soil below. It has two ways of spreading, one underground by means of new corms growing from the larger ones, and the other by means of seeds, many of which are probably perfected through the pollen carried by insects.

Method—This plant should be studied in the woods, notes being made on it there. But a plant showing corm, roots, leaves and blossom should be brought to the schoolhouse for detailed study, and then planted in a shady place in the school garden.

Observations—1. Where does the adder’s tongue grow? Do you ever find it in open fields? How early do you find its leaves above ground? At what time does its blossoms appear?

2. How many leaves has each plant? What colors do you find in them? What is the color of their petioles? Do the leaves remain mottled later in the season?

3. Do the adder’s tongue plants occur singly or in patches? Dig out a plant and see if you can find why the plants grow so many together?

4. How far below the surface of the ground did you find the corm or bulb-like growth? Is this the root of the plant? How does it differ from the roots? How does it differ from a bulb? Of what use is it to the plant?

5. Is the flower lifted up, or is it drooping? What is its general shape? How many sepals? How would you know they were sepals? How do they differ in color, outside and in, from the petals? How are the petals marked? Can you see the lobes at the base of each petal? When sepals and petals are so much alike the botanists call them all together the perianth.

6. If the perianth, or the sepals and petals together, make a bell-shaped flower, what makes the clapper to the bell? How do the insects use this clapper when they visit the flower? Do the flowers stay open nights and dark days? Why?

7. How many stamens are there? Describe or sketch one, noting its peculiar shape. Are the stamens all the same length? Can you see the pistil and its stigma? Where is it situated in relation to the stamens? Do you think the stigma is ready for pollen at the time the anthers are shedding it?

8. After the petals and sepals fall what remains? How does the ripe seed-capsule look? How does it open to let out the seeds? Are there many seeds in a capsule? What is their shape?