50 



Botanical Section 



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tive size of common grass "seeds." 

 size. 



Aira flexuosa. 



A. caryophyUea. 



A. ccespitosa. 



Alopecurus pratensis. 



A. agrestis. 



A. gzniculaius. 



Holcus mollis. 



H. lunulas (in glumes). 



H. lanatus (without glumes). 



Phleum pratense. 



Poa pratensis. 



P. trivialis. 



P. nemoralis. 



P. annua. 



Agropyrum repens. 



Nardus stricia. 



Glycerin aquation. 



67. fiuitans. 



Agrostis alba. 



Melica nutans. 



Kcelcria cristata. 



Molinin ccerulea 



Hordtum pratense. 



II. murinum. 



Elym u s a re n a r ius. 



Psammn. arenaria. 



Digrapkis arundinacea. 



Wheal grain (for comparison of size) 



