146 LABORATORY AND FIELD EXERCISES 



REPRODUCTION 



1. The flower and its parts. Consult the text under repro- 

 duction and review the floral parts outlined in Part I. 

 See also Descriptive Terms, at the beginning of Part III 

 of the text. 



a. Structure of the flower. Determine which of the follow- 

 ing terms apply to the flower you are studying. These 

 terms are denned under Descriptive Terms, Part III 

 of the text. 



(1) Is the flower you are studying hypogynous, perigy- 



nous, or epigynous ? Is it perfect, imperfect, com- 

 plete, or incomplete ? Is it regular or irregular ? 



(2) Are its parts arranged in spiral or cyclic form ? How 



many parts are there in each set of protective and 

 essential organs ? What is the floral plan ? 



(3) Construct a ground plan of the flower. Record 



the answers to questions asked above under (1) 

 and (2). 



(4) The flower as modified strobilus. Bisect the flower 



and receptacle vertically, and note the arrange- 

 ment of its parts on the receptacle. Does the 

 flower correspond to a strobilus in the nature 

 and arrangement of its parts ? Compare with 

 strobili of spruce. To what does the receptacle 

 of the flower correspond in a strobilus ? To what 

 do the stamens, pistil, and perianth correspond ? 

 What are the ovules and the anthers morpho- 

 logically ? What fundamental differences exist 

 between the strobili of the spruce and the flower 

 you are examining? What new structures are 

 found in flowers of the angiosperms as compared 

 with the strobili of gymnosperms. 



