194 FOUNDAIIONS OF BOTANY 



206. The Flower of the Tulip.^ — Make a diagram of a side view 

 of the well-opened flower, as it appears when standing in sunlight. 

 Observe that there is a set of outer flower-leaves and a set of inner 

 ones." Label the outer set sepals and the inner set petals. In most 

 flowers the parts of the outer set are greenish, and those of the inner 

 set of some other color. It is often convenient to use the name 

 perianth, meaning around the flower, for the two sets taken together. 

 Note the white waxy bloom on the outer surface of the outer seg- 

 ments of the perianth. What is the use of this ? Note the manner 

 in which the inner segments of the perianth arise from the top of the 

 peduncle and their relation to the points of attachment of the outer 

 segments. In a flower not too -widely opened, note the relative posi- 

 tion of the inner segments of the perianth, how many wholly outside 

 the other two, how many wholly inside, how many with one edge in 

 and one edge out. 



Remove one of the sepals by cutting it ofE close to its attachment 

 to the peduncle, and examine the veining by holding it up in a strong 

 light and looking through it. Make a sketch to show the general 

 outline and the shape of the tip. 



Examine a petal in the same way, and sketch it. 



Cut ofE the remaining portions of the perianth, leaving about a 

 quarter of an inch at the base of each segment. Sketch the upright, 

 triangular, pillar-like object in the center, label it pistil, sketch the 

 organs which spring from around its base, and label these stamens. 



Note the fact that each stamen arises from a point just above and 

 within the base of a segment of the perianth. Each stamen consists 

 of a somewhat conical or awl-shaped portion below, the filament, sur- 

 mounted by an ovate linear portion, the anther. Sketch one of the 

 stamens aboUt twice natural size and label it x 2. Is the attach- 

 ment of the anther to the filament such as to admit of any nodding 

 or twisting movement of the former ? lu a young flower, note the 

 two tubular pouches or anther-cells of which the anther is composed, 

 and the slits by which these open. Observe the dark-colored pollen 



1 Tvlipa Gesneriana. As the flowers are rather expensive, and their parts 

 are large and firm, it ia not absolutely necessary to give a flower to each pupil, 

 but some may be kept entire for sketching and others dissected by the class. 

 All the flowers must be single. 



2 Best seen in a flower which is just opening. 



