270 



PLANT STRUCTURES 



gcea), wintergreen (GaultJieria), heather (Calluna), moun- 

 tain laurel (Kalmia), Azalea, Rhododendron (Fig. 256), 

 Indian pipe {Monotropa), etc. 



Fig. 255. Flowers of heath plants (Erica), showing complete flowers (A), the sta- 

 mens with " two-horned " anthers which discharge pollen through terminal pores, 

 and the lobed syncarpous ovary with single style and prominent terminal stigma 

 (B, C, D).— After Drudb. 



145. Convolvulus forms. — The well-known morning-glory 

 (Ipomoea) (Fig. 209) may be taken as a type of the Convol- 



