70 



HOW PLANTS ARE PROPAGATED. 



petals, eight stamens (twice four), and four pistils. So the flower of Trillium (Fig. 

 162) is symmetrical; for it consists of three sepals, three petals, six stamens (one 



before each sepal and one before each petal), and 

 a pistil plainly composed of three put together, 

 having three styles or stigmas. Flax affords an-' 

 other good illustration of symmetrical flowers (Fig. 

 170) : it has a calyx of five sepals, a corolla of 

 five petals, five stamens, and five styles. In such 

 flowers, and in blossoms generallj^, the parts alter- 

 nate with each other ; that is, the petals stand be- 

 fore the intervals between the sepals, the stamens, 

 when of the same number, before the intervals be- 

 tween the petals, and so on. 



208. All Uiisymmetrical Flower is one in which 

 the diflTerent organs or 

 sets do not match in 

 the number of their 

 parts. The flower of 

 Anemony, Fig. 163, is 

 unsymmetrical, having 

 many more stamens 

 and pistils than it has 

 calyx-leaves. And the 

 blossom of Larkspur 

 (Fig. 171) is unsym- 

 metrical, because, while p ( 

 it has five sepals or 

 leaves in the calyx, there are only four petals or co- 

 rolla-leaves, but a great many stamens, and only one, 

 two, or three pistils. The sepals and petals are dis- 

 played separately in Fig. 172; the five pieces marked 

 s are the sepals ; the four marked p are the petals. 



209. A Regular Flower is one in which the parts of each sort are all of the san k 

 shape and size. The flowers in Flax (Fig. 170) and in all the examples pre- 

 ceding it are regular. While in Larkspur and Monkshood we have not only an 

 unsymmetrical, but 



