354 THE HIGHER DICOTYLEDONS. 



The plant may send up branches when the flowers of the 

 main shoot are nearly over, or in cases where the main stem 

 has been damaged ; these branches are quickly formed if the 

 main stem is cut off either near the base or below the 

 flowers. 



Note the arrangement of the flowers in a long raceme, with 

 a small leaf (bract) below each flower. The young flower is 

 erect, but before opening it begins to droop owing to the 

 bending downwards of the short stalk. The flowers are 

 arranged spirally on the stem. Do they spread out in all 

 directions when open? If not, how are they brought into 

 their final position, and why ? Note the calyx, deeply cleft 

 into five lobes, the uppermost narrower than the others. 



CALYX 



POST. SEPAl, 



NECTARY 



Fig. 145. Longitudinal Section of Flower of Foxglove. 



Sketch (1) a complete flower in side view, (2) the parts 

 seen on looking into the mouth of the corolla, (3) the isolated 

 corolla (pulled away from flower) in side view, (4) isolated 

 corolla slit open along the middle line above, (5) the pistil 

 and nectary, with calyx removed, (6) a section of the entire 

 flower (Fig. 145). Note the peculiar form of the corolla: 

 why is the tube dilated at the base, then narrowed, then 

 widened out? Why is the mouth of the corolla longer 



