The Fact and Philosophy of Variation 3 



In timothy, one of the commonest of our grasses, a 

 casual observer may find differences in the length, shape, 

 and color of heads; tendency of some plants to produce 

 asexual leaves in the head: form. of base of the head; 



FIG. 1. Variation in heads of timothy. 



length, width, and color of leaves; erect or drooping 

 character of the leaves ; susceptibility of the leaves and 

 stems to rust ; period of blooming ; habit of growth of 

 plant, erect or decumbent ; few or many culms to the 

 plant ; ability to recover after cutting ; quantity of seed 



