which conceals the lower part of the flower. 
THE FLOWER 
205 
Remove the 
spathe and observe that the lower part of the perianth is 
united into a long, narrow tube, from 
Fic. 290.—Iris flower: 
sp, spathes; s, sepals + p, 
petals = perianth. 
narrowed and bent inward, petals. 
222. 
Sketch the out- 
side of the flower, 
labeling the ob- 
long, three-lobed 
enlargement at 
the base, ovary; 
the prolongation 
above it, tube of 
the perianth; the 
three outer lobes 
with the broad 
sessile bases, 
sepals; the others, 
with their bases 
the top of which the sepals and petals 
extend as long, curving lobes. 
Arrangement 
of parts. — 
ove"! 
Fic. 291.— Vertical 
section of iris flower: 
ov, ovules ; pl, placenta ; 
tu, tube of the perianth 
inclosing the style; sta, 
stamen ; sti, stigma: vo, 
ovary. (After GRay.) 
Now turn the flower over 
and sketch the inside, labeling the three large, petal-like expan- 
sions in the center, 
stigmas. Do you 
see any stamens? 
Remove one of 
the sepals and 
look under the 
stigma; what do 
you find there? 
Notice the little 
honey pockets at 
the foot of the 
stamen. Run the 
Fic. 
292.— Vertical 
section of iris flower, with 
perianth removed, showing 
a stamen and three stig- 
mas: su, stigmatic surface. 
Fie. 293.—Cross sec- 
tion of ovary of iris flower: 
c,¢, earpels; 1, 1, locules; 
ov, ovules; pl, placenta. 
head of your pencil into them and see what would happen 
to the head of an insect probing for honey. 
