220 GOTE TURESSON 
of the panicle is seen every year in these individuals, so there is little 
doubt as to the hereditary nature of the variations seen between the 
different plants. A few of the plants in the series have somewhat 
hairy flowering scales and should not be referred to var. lobata accor- 
ding to the diagnosis given of the form in the floristic handbooks. 
They correspond in all other respects, however, with the shade variety, 
and thus illustrate the difficulties and perhaps the impossibility — 
with which the systematists are confronted in their efforts to draw 
Fig. 2. Dactylis glomerata. Illustrating different shapes of panicle found 
within the shade type. 
hard and fast lines between a certain variety and its supposed 
main type. 
It should not be thought that modificatory shade forms of D. 
glomerata do not exist. Such forms are, on the contrary, recorded 
several times. They are often much like the var. lobata, although they 
are usually furnished with some hairs on the flowering scales. From 
what has been said above with regard to the occurrence of hairy scaled 
individuals whithin the hereditary shade variety it will at once be seen 
that the difficulty with regard to the separating of the modificatory 
