THE PLAN 9 



a pin. It must be noted that some flowers 

 have not all the four sets of organs. The pistils 

 and stamens are of the greatest importance 

 when we come to classification (Fig. 3). 



The other parts of the flower or plant, such 

 as leaves, prickles, tendrils, bracts, glands, fruits 

 and seeds, are of great value for distinguishing 

 different classes and orders. Our British Wild 

 Flowers chiefly fall into two great groups, known 

 as monocotyledons and dicotyledons ; and they 

 are distinguished as follows : 



FIG. 2. DIAGRAM OF MONO- AND DICOTYLEDON. 



A. Monocotyledon ; B, Dicotyledon. I. Pistil ; 2. Inner whorl 

 of stamens ; 3. Outer whorl ; 4. Petals ; 5. Calyx. The 

 perianth is made up of 4 and 5. 



MONOCOTYLEDONS | DICOTYLEDONS 



Leaves 

 with parallel veins. | with netted veins. 



Organs of flowers in 

 threes or sixes. in fours or fives. 



Stem 



with separable bark. I without separable bark, 



wood in bundles, not in rings. | wood in annual layers or rings. 



Seeds 

 with one seed leaf. with two seed leaves. 



