1 68 INDEX TO SPECIES. 



Pinnata, Festuca, 61 

 Pinna turn, Brachy podium, 61 

 Pinnatum, Triticum, 61 

 Pinnatus, Bromus, 61 

 Planicularis, Avena, 42 

 Polymorpha, Agrostis, 27 

 Polymorphus, Bromus, 67 

 Polynoda, Poa, 87 

 Praecox, Aira, 39 

 Praecox, Avena, 39 

 Pra tense, Hordeum, 53 

 Pratense, Phleum, 13 

 Pratense, Trisetum, 42 

 Pratensis, Alopecurus, 19 

 Pratensis, Avena, 42 

 Pratensis, Poa, 88, 90 

 Procumbens, Festuca, 8 s 

 Procumbens, Glyceria, 83 

 Procumbens, Poa, 8^ 

 Procumbens, Sclerochloa, 8^ 

 Pubescens, Avena, 42 

 Pubescens, Trisetum, 42 

 Pumila, Agrostis, 26, 27 

 Racemosus, Bromus, 67 

 Racemosus, Serrafalcus, 67 

 Ramosus, Bromus, 67 

 Repens, Agropyrum, 56 

 Repens, Triticum, 56 

 Retrofiexa, Poa, 82 

 Rigida, Festuca, 84 

 Rigida, Glyceria, 84 

 Rigida, Poa, 84 

 Rigida, Sclerochloa, 84 

 Rigidum, Hordeum, 55 

 Rigidus, Bromus, 66 

 Rubra, Agrostis, 30 

 Rubra, Festuca, 69 



