[11] 93 FLOWERING PLANTS 



Morphology of the Flower. 

 Buttercup (Ranunculus). 



Sketch a single flower cut in half longitudinally exactly down the middle with a razor or very sharp knife, 

 shewing (a) receptacle, (b) calyx of sepals, (c) corolla of petals, (d) stamens, (e) carpels, (/) nectaries on the petals. 



STAMENS. 



A . Sketch under a lens, a single stamen shewing (a) the filament, (b) the anther with its two pairs of pollen- 

 sacs, (c) the connective or continuation of the filament between the pollen-sacs, and (d) the line of dehiscence of 

 the anthers. 



B. Examine transverse section through a young anther and draw (a) the four pollen-sacs containing pollen- 

 grains, (b) the connective traversed by a vascular bundle, (c) the fibrous layer below the epidermis. 



C. Draw also the section through a mature anther shewing the dehiscence. 







