Cultivated-Plant Study 651 



3. Plant some of the soaked peas in the garden. How do the 

 young plants look when they first appear? Does the fleshy part of the 

 seed remain a part of the plant and appear above the ground, as is 

 the case with the bean ? What becomes of the meat of the seed after 

 growth has started? 



4. Do the first leaves which unfold from the seed pea look like the 

 later ones? Are the leaves simple or compound? Do they grow 

 opposite each other or alternately? 



5. Take a leaf and also a spray of the tendrils. How many leaflets 

 are there in a compound leaf? Describe the petiole and the basal leaves. 

 How far apart are the leaflets on the mid-stem? Compare the stem 

 on which the tendrils grow with this leaf. Are the basal leaflets like 

 those of the leaf ? Isthe petiole like that of the leaf ? Do you think that 

 the leaflets toward the tip of the stem often change to tendrils? 

 Why do you think so? Why must the sweet pea have tendrils? Do 

 you see the earlike stipules at the base of the leaf? Are there similar 

 stipules at the base of the tendril stem? 



Observations on the flower and fruit — i . Take the sweet pea in blossom. 

 Why is the large upper petal called the banner? How does it compare 

 in size with the other petals? What is its purpose when the flower is 

 open? Why do you think the side petals are called wings? What is their 

 position when the flower is open? 



2. Describe that part of the flower below the wings. Do you think 

 that it is made of two petals grown together ? Why is it called the keel of 

 the flower? Press down with your finger on the tip of the keel. What 

 happens? Is your finger splashed with pollen? Where is the nectar in 

 the sweet pea? Would an insect getting the nectar press down upon the 

 keel and receive a splash of pollen? 



3. Open the keel. How many stamens do you find within it? How 

 many have their filaments joined together? Is there one separate from 

 the others? Against what are the anthers pressed by the keel? 



4. Remove the stamens and describe the pistil. Which part of this 

 will make the pod in which the new peas will develop ? Describe how the 

 style is curved. How is the style covered near its tip? What is this 

 brush for ? Can you find the stigma with the help of the lens ? When the 

 bee is seeking for nectar and pushes down on the keel, does the stigma 

 push out at the same point as the pollen? Does this enable the stigma 

 sometimes to receive pollen which the bees bring from other flowers? 



5. Describe an unopened flower bud. What is its position? How 

 many lobes to the calyx? . What is their shape, and how do they protect 

 the bud ? Which petal is folded over all the others ? How does the posi- 

 tion of the open flower differ from that of the bud ? 



6. How does the young pod look when the petals fall? How does it 

 look when ripe? How does it open to scatter little, ripe sweet peas? Do 

 the lobes of the sepals still remain with the pod ? 



