150 



Photo by H. Witte. 



FIG. XLVII. Orchard Grass: Average panicles of mother plant (M) and a number of its 

 progeny. Note variable character of the latter (82, p. 29). 



in grasses an unusually great multiformity of distinct biotypes which may be 

 distinguished by differences in physiological as well as in morphological 

 characters, thus (82, p. 4) : 



A. Morphological Characters 



1. Length of stem. 



2. Thickness of stem. 



3. Degree of stooling and position of stems. 



4. Size, position and profusion of leaves. 



5. Color of leaf. 



