102 LABORATORY EXERCISES 



hepatica, dog tooth violet, anemone, and wild rose are excellent 

 material. The blossoms of the apple, cherry, pear, plum, and straw- 

 berry may be used. The Easter lily is excellent because of its size. 

 The clover illustrates flowers that grow in a "head"; the dandelion is 

 an example of composite flowers. 



a. Read carefully 318 and 319 of the text; then examine 

 the flower in hand. Has it a distinct stalk? Is the stalk thick 

 or slender? Rough or smooth? Is it tough, or easily broken? 



b. Has the flower a calyx? Its color? Is the calyx made 

 up of separate parts, or are they united? What are these parts 

 called? How many are there? 



Examine the receptacle; has it any special shape or color? 



c. Describe the corolla, giving its color, markings, number 

 of parts, and the shape of the parts. What are the parts of 

 the corolla called? Are they alike in all respects? 



d. Describe the stamens, giving their number, color, shape, 

 and arrangement. Describe the filament; the anther. Is 

 there pollen? 



Do the stamens grow directly on the receptacle, or are they 

 attached to the corolla or other plant organ? Are all the 

 stamens of the same length? 



e. Examine the pistil of the flower; what is its shape and 

 color? What is the form of the style? How many carpels are 

 there in the pistil? How many stigmas are there? 



What is the form of the ovary? Cut across the ovary at 

 the top and at the thickest part. Describe and draw what you 

 see. How many compartments are there in the ovary? Cut 

 lengthwise through the ovary; how are the ovules attached? 



/. Is the flower you are studying built on the plan of 3, or 

 of 5 parts? What kind of veining has the leaf of the plant? 

 Compare this flower with others, note resemblances and differ- 

 ences. Can you find any connection between the kind of vein- 

 ing of the leaf and the number of parts of the flower? 



