EXPERIMENTAL EVOLUTION 
539 
bur oaks, live oaks, etc.), and have thereby recognized 
that certain kinds resemble each other closely enough to be 
placed in one group with a group-name. All the com- 
mon names of plants indicate the recognition of classes 
a classification. 
FIG. 403. Linnaeus, the great classifier (1707-1778). He is wearing a 
sprig of the twin- flower (Linncea borealis), one of his favorite flowers, and 
named after him by his friend, Gronovius. He is regarded as the father 
of modern systematic botany. 
460. Evolution and Ckssification. Without the guiding 
idea of evolution classification would be arbitrary and 
artificial. Linnaeus classified plants on the basis of the 
number of stamens they possessed, thus placing in one 
group plants now known to be wholly unrelated, except 
