vi INTRODUCTION 



and "(y) Erect herbs, or tendril climbers." The morning glory twines or climbs without tendrils, 

 and our plant thus belongs to the "Convolvulaceae » This family is found in the text on page 14. 

 Here the first step is to read carefully the description of the morning glory family. If there are 

 no points of disagreement, the plan! has been traced to the right family, and it is then necessary to 



III. Leaf Edges 



1. Serrate (saw-toothed). 

 4. Tndulate (wavy). 



2. Dentate (toothed). 

 5. .Sinuate (bayed). 



3. Crenate (scalloped). 

 6. Incised (lagged). 



determine the particular genus by reference to the key which follows the family description. The 

 morning glory clearly falls under "1. Stems leafy, green; flowers large." The choice then lies be- 



IV. Leaf Tips 



4 5 6 7 



2. Acute. 3. Obtuse. 4. Truncate. 



Emarginate. 7. Obcordate. 8. Cuspidate. 9. Mucornate 



1 2 

 1. Acuminate. 



8 9 



5. Retuse. 



t wiin "a. Stigma capitate or head-like" and "b. Stigmas 2, linear." Since the stigma is one and 

 capitate, the choice then falls between "(1) Leaves pinnately parted; corolla salver-form" and "(2) 



V. Lobed Leaves 



Pinnately: 1. Lobed. 

 Palmately; 2. Loced. 



3. Cleft. 

 4. Cleft. 



5. Parted. 7. Divided. 



6. Parted. 8. Divided. 



