84 



Elementary Work in Botany. 



of Fig. 63 will show you this fact and enable you to make 



similar diagrams. Do this. 



Provide a fresh supply of flowers and buds for the next 



work. Periwinkle, oleander (single), pansy, potato, night- 

 shade, manzanita, ma- 

 drona, are desirable. 



EXERCISE 46. 



Stamens. In a 

 typical flower the an- 

 cestral form, probably, 

 of all complete flowers 

 the stamens, like the 

 other floral leaves, grow 

 separately upon the re- 

 ceptacle. As you have 

 learned, they often 

 seem to grow upon the 

 calyx or corolla, and sometimes upon the pistil. Since it is 

 probable that in all cases they originate in the receptacle, it 

 is better to say they are adherent or adnate to the calyx, 

 corolla, or pistil.* When, as in hookera (Fig. 64), the fila- 

 ments are easily traced down to the receptacle, the stamens 

 may be described as inserted at the summit of the perianth 

 tube, with filaments decurrent (running down) to the base, 

 the free portion erect and shorter than the anther; or, 



Fig. 63. Bud of swett-pea shown natural size at a. 

 b. A longitudinal section, c . A cross-section at s. d. A 

 diigramatic section representing the relations of all 

 the parts to each other in the bud. An ovule is in the 

 center surrounded by the carpel. The next enclosing 

 line represents the stamens all united except the upper 

 one. Then follow the two keel petals united below; 

 the wing petals not united and the upper petal (banner) 

 enclosing all. Outside are the five united sepals; one 

 below, two above, and one on each side. 



* Perhaps an inferior ovary is covered by traces of stamens and petals beneath 

 the calyx coat. 



