Variation and Correlation in Timothy. 



425 



At the Cornell University Experiment Station the following variations 



have been observed: 



Variation in leaf characters. — In 



width, the leaves vary from .25 to 



.75 inches; in length, from 4 to 15 



inches. The angle which the leaves 



make with the stem is also subject 



to considerable variation: in some 



plants the leaves are nearly erect, 



while in others they are spreading 



or even drooping. 



The leaves may be flat, which is 



the most common type, or they may 



be boat-shaped or even rolled in the 



form of a spiral. Some plants pro- 

 duce an abundance of leaves while others are nearly destitute of foliage. 



The range in the number of leaves per stem is from 3 to 8. 



Variation in stem characters. — In height, the plants vary from 18 to 



55 inches. (See Table I.) If the coefficient of variability (Table V) 



be taken as an index of variation, it will be seen that there is less 



variability in height than in any of the other characters studied 



statistically. In diameter of stem, the range 

 is from .05 to. 15 inches. In direction of stem 

 all gradations may be found from erect to 

 decumbent. 



Fig. 114. Variation in leaf characters. 



Fig. 115. Variation in 

 shape' of head. From 

 left to right: (i) cy- 

 lindrical. (2) conical, 

 {3) fusiform. 



Fig. 1x6. Variation in base of head. 



