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GROUP XII. Blade Ribless, with Median Lines 68 



Poa 68 



Thick-bladed Pratensis, Compressa, Maritima, 



Alpina 68 



Thin-bladed and flat-sheathed Annua, Trivialis, 



Bulbosa 68 



Thin-bladed and round-sheathed Nemoralis, Fertilis 69 



Net-sheathed aquatics Catabrosa, Glyceria 70 



Dry-bladed Avena species 70 



Notes 71 



GROUP XIII. Hairless, with very low, flat ribs .. 72 



Alopecurus, Phleum, Briza, Milium (ribless). 

 'Succulent-bladed Poa (or Sclerochloa). 

 Note on hairy species Avena elatior, Triodia, 



Triticum 73 



GROUP XIV. Ribs high (rounded or acute) and prominent 73 



Hairless 73, 



Hard-bladed Psamma, Elymus, Aira 73 



Firm-bladed, sheath coloured Lolium, Festuca, 



Cynosurus, Agrostis 74 



Sheath not coloured Agrostis, Alopecurus 75 



Hairy 76 



Notes 76 



INDEX OF COMMON NAMES 79 



INDEX OF LATIN NAMES . 88- 



