80 PLANT BIOLOGY 



3. Locate the pairs of petals that are nearly alike in size 



and shape. 

 State the position of the odd petal. 



4; On which of these petals do you find the most strik- 

 ing spots or lines of color ? 



5. Make a drawing of the pansy in its natural position, 



front view, and natural size. Label top petals, 

 side petals, lower petal, hairs on side petals, 

 color spots. 



6. Remove the two upper petals, and the two side 



petals. Now observe the tapering projection 

 on the lower or odd petal extending upward and 

 backward between the sepals. This is called 

 the spur. 



a. Tell what you have done and seen. 



b. Carefully remove the lower petal with the spur 



attached, and make a drawing of it, natural 

 size. Label the spur and color spot. 



7. Slit open the spur. Is the spur hollow or solid ? 



8. The spur contains a sweet liquid called nectar which 



attracts the bees and other insects. If you find 

 any nectar, describe it and tell how you found 

 it. Describe the taste of the nectar. 



9. In what two ways, therefore, may pansies attract 



bees? 



10. On which petal would a bee be most likely to alight 



in visiting a pansy? What is there on this 

 petal to guide the bee toward the supply of 

 nectar ? 



11. (Optional.) What structures on the side petals might make 



it difficult for the bee to insert its mouth parts in 

 this region ? 

 B. Stamens. 



1. Observe the stamens arranged around the pistil. 



Carefully separate them with a needle or pin. 

 State the number and situation of the stamens. 



2. Carefully bend two or more stamens away from the 



pistil, and with the help of a magnifier look 



