FLOWER OF TRILLIUM 65 



knife), and sketch the stamens, together with the other 

 structure, the pistil, which stands in the center. 



Cut off one stamen, and sketch it as seen through the lens. 

 Notice that it consists of a greenish stalk, the filament, and 

 a broader portion, the anther. The latter is easily seen to 

 contain a prolongation of the green filament, nearly sur- 

 rounded by a yellow substance. In the bud it will be found 

 that the anther consists of four long pouches, or pollen cham- 

 bers, which are attached by their whole length to the fila- 

 ment. "When the flower is fairly open the pollen chambers 

 of each pair have already split down their margins, thus 

 appearing as one on each side, and are discharging a yellow, 

 somewhat sticky powder, the pollen. 



Examine one of the anthers with a lens and sketch it. 

 Cut thin cross sections of an immature anther and draw 

 under l.p., showing the pollen chambers. 

 G. Cut away all the stamens and sketch the pistil. It consists of a 

 stout lower portion, the ovule case, or ovary, which is six-ridged 

 or angled, and which bears at its summit three slender stigmas. 



In another flower, which has begun to wither (and in which 

 the ovary is larger than in a newly opened flower), cut the 

 ovary across about the middle, and with the lens determine 

 the number of chambers, or locules, which it contains. Exam- 

 ine the cross section with the lens ; sketch it, and note par- 

 ticularly the appearance and mode of attachment of the 

 undeveloped seeds, or ovules, with which it is fiUed. Make a 

 vertical section of another rather mature ovary, and examine 

 this iu the same way. 

 H. Using a fresh flower, construct a diagram to show the rela- 

 tion of the parts on an imaginary cross section.^ Construct 

 a diagram of a longitudinal section of the flower, showing 

 the contents of the ovary. 



1 It is important to notice that such a diagram is not a picture of the section 

 actually produced by cutting through the flower crosswise at any one level, but 

 that it is rather a, projection of the sections through the most typical part of each 

 of the floral organs (see Principles, Fig. 138). 



