x*x 



INTRODUCTORY LESSONS. 



resemble nets. Examine the leaves of Iris, Calla, or any tbat are grass- 

 like, and yoLi will see why they are called Parallel-veined. 



33. Netied-veinedlesiYes glow on Exogenous stems. Parallel-veined leaYes 

 grow on Endogenous stems. The former belong to plants which grow from 

 Dicotyledonous seeds; the latter to plants from Monocotyledonous seeds. 



Flowers. Get a bunch of Mustard flowers — Wall-flowers, single 

 Stock, or Eadish 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 Ccdyx ; the 

 former are Petals, and together form the Corolla. Pull off the sepals, 

 observing that they alternate with the j^etals. Next remove the petals. 

 The broad part of each petal is called the blade, the narrow jDart, 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 Stamens. 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 

 3^ou may see the minute Ovules, which are the beginnings of seed. The 

 part containing the ovules is the Ovary ; the naked ujDper end of the jdIs- 

 til is the Stigma, and the jjart 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 

 3^ou 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, 



if f/-.llr^wa +1-1 f 47 • ^l^agnified Mustard flower with four of the stamens, 



It lOilOWS inab three petals and throe sepals removed. 



