152 



ESSENTIALS OF BOTANY 



sympetalous corolla and these are of much use in accurate 

 descriptions of seed-plants. A few of these are illustrated 



/~^.T>- 



FiG. 103. 



Bell-Shaped Corolla of 

 Bell-Flower (Cam- 

 panula). 



Fig. 104. 

 Salver-Shaped Corolla of 

 Jasmine. (Magnified.) 



Wheel-Shaped 

 Corolla of 

 Potato. 



in this chapter 

 (Figs. 103-107). 



181. Forms of 

 the Stamen; Union 

 of Stamens. — Sta- 

 mens are of many 



specialized forms to adapt them to their functions in 



flowers of various shapes, 



but many are of the shape 



shown in Fig. 108. Such 



a stamen consists of an 



expanded part, the anther, 



borne on a stalk called 



th.Q filament. Anthers are 



often nearly or quite ses- 

 sile (i.e. destitute of fila- 

 ments). Inside the anther 



is the powdery or pasty 



substance called pollen 



(Sect. 190). 



Stamens may be wholly unconnected with each other, or 



distinct, as shown in Figs. 97, 98, 100, or they may be 



Fig. 100. Fig. 107. 



Tubular Corolla, from Labiate or Ringent 



Head of Bachelor's Corolla of Dead 



Button. Nettle. 



