52 REPRESENTATIVE PLANTS 



The flower calyx. Examine the flower for its size, color, 

 and position. Stud}^ the outer (lower) whorl or circle of 

 parts. What color do the parts have? This whorl is the 

 calyx and its parts are sepals. How many of these are 

 there ? Are they stalked or sessile ? What is their shape ? 

 Examine their venation. Where are they found in the 

 unopened bud, and what seems to be their function ? Draw 

 a sepal. 



Corolla. Examine the whorl next within (above) the 

 sepals. What color has this whorl and into how many 

 parts is it divided ? This is the corolla and the parts are 

 petals. Study a petal and its shape, direction of growth, 

 and venation. Draw a petal. 



Stamens. Next within (above) the petals are a number of 

 oblong or linear structures. How many are there, and what 

 is their color ? These are stamens. Find the two parts 

 named under the willow. Investigate their exact position 

 and discover if they are in one or tiuo rows. Draw a 

 stamen, two views to show its exact form (face and side 

 view). 



Pistil. Study the central structure, pistil, and find its 

 parts. (See willow.) What is its color and shape ? Draw 

 a pistil, side and top views. 



Details of structure. Examine an anther on the concave 

 face (m) and observe two lines of yellow. Examine a cross 

 section of the anther (Ip) and see that these lines really 

 are pollen sacs or microsporaiigia. Make drawings showing 

 both the above features. In the stamen section, look for 

 the cell structure. Compare it to a leaf section. The 

 stamen is really a sjxjrophi/ll or modified leaf. 



Study the pollen (//)) or (hp). What is the color and form ? 

 Draw several pollen cells. 



Examine the stigmatic surface of the pistil (m), for any 

 peculiarities observable. Draw, if possible (i.e., not too 

 complex or difficult). 



