THE FLOWER. IT 



When the parts of the floral whorls are in threes, 

 the symmetry is trimerous^ or ternary (Fig. 4). 



When the parts are in fours, the symmetry is te- 

 tramerous, or quaternary. 



When the parts are in fives, the symmetry is said 

 to be pentamerouS) or quinary (Tigs. 1 and 2), 



If you have the botanical charts, look at the mag- 

 nified flowers represented on them, and point out the 

 symmetrical ones, naming the kind of symmetry they 

 exhibit. Then examine your living specimens. These 

 will, of course, vary with the season. We will sup- 

 pose, for example, that you have the pea, morning- 

 glory, violet, portulacca, buttercup, Saint- John' s- 

 wort, hollyhock, potato-blossom, evening primrose, 

 lily, etc. Decide which are symmetrical and which 

 are unsymmetrical, placing the two kinds apart. Re- 

 examine the symmetrical ones, and tell which have 

 binary symmetry, which ternary, which quaternary, 

 and which quinary. 



Binary From the Latin Mnarius, compounded of two, 

 parts in twos. 



Ternary Latin ternarius, consisting of threes. 



Quaternary Latin quaternarius, containing four, by fours. 



Quinary Latin quinus, five, arranged in fives. 



Dimerous From two Greek words, meaning twofold and 

 part. 



Trimerous From two Greek words, meaning three, or thrice, 

 and part. 



TetramerousFrom two Greek words, signifying four and 

 part. 



Pentamerous From two Greek words, meaning five and 

 part. 



