p:o:¢ INTRODUCTORY LESSONS. 
resemble nets. Examine the leaves of Iris, Calla, or any that are grass- 
like, and you will see why they are called Parallel-veined. 
Netied-veined leaves grow on Exogenous stems. Parailel-veined leaves. 
grow on Endogenous stems. The former belong to plants which grow from 
Dicotyledonois seeds; the latter to plants from Monocotyledonous seeds. 
Flowers. Geta bunch of Mustard flowers—Wall-flowers, single 
“Stock, or Radish flowers will do as well. Pluck a single blossom and 
note these facts: The most conspicuous part consists of four yellow 
leaves; outside of these are four smaller greenish yellow leaves in pairs. 
not quite alike. The latter are Sepals, and together form the Calyx ; the 
former are Petals, and together form the Corolla. Pull off the sepals, 
observing that they alternate with the petals. Next remove the petals. 
The broad part of each petal is called the blade, the narrow part, the claw 
(corresponding to the petiole of an ordinary leaf). Inside of the petals. 
you find six yellow-headed bodies with white stems, two of which are 
shorter than the remaining four. These are the Siamens. Their stems 
are Filaments ; the yellow heads are Anthers, and the yellow powder which 
they contain is Pollen. In the center of the flower is a club-shaped body 
called the Pistil. This is the young seed-pod, and by splitting it open 
you may see the minute Ovules, which are the beginnings of seed. The 
part containing the ovules is the Ovary; the naked upper end of the pis- 
til is the Stigma, and the part connecting the stigma with the ovary is the 
Style. The end of the stem 
upon which the parts of the 
flower grow is the Receptacle, 
and the stem is called a Pe- 
duncle. Fig. 47 will assist 
‘you in learning these names. 
A Complete Flower 
must have calyx, ‘corolla, 
stamens and pistils; but, since 
‘the office of a flower is to pro-- 
duce seeds, and these grow 
from ovules, which pollen has 
reached by way of the stigma, 
a 47. Magnified Mustard flower with four of the stamen 
it follows that three petals and three sepals removed. ° 
