Index to Genera. 



227 



Muhlenbergia 69 

 Munroa 64-5 

 Myrica 165-6 

 Myriophyllum 58 

 Myrsine 170 



Najadopsis 164 

 Nardus 209, 217-8 

 Nasturtium 58 

 Negundo 39, 68 

 Nelumbo 58 

 Nomada 61 

 Notholaena 60 

 Nupbar 58 

 Nymphaea 58, 73 



Oenothera 59-61 

 Olea 170 

 Omphalina 80 

 Ophioglossum (163) 

 Opuntia 64-5 

 Oryza201, 217-9, pL 17 

 Osmorrhiza69 

 Ostrya, 69, 167 

 Oxybaphus 63-4 



Palaeocarya 178 



Paliurus 173 



Palmocarpon 165 



Panicum 59, 65, 200, 204, 217-220, 



pi. IS, 19 

 Panurginus 48-50 

 Panurgus (45) 50 

 Parandrena 47 

 Paronychia 61 

 Paspalum 62 

 Patula (82) 

 Pellaea 60 

 Pentstemon 60-2 

 Petalostemon 60-1, 65 

 Peucedanum 60 

 Phalaris 205, 217-9, pi. 1 7 

 Philomycus 82 



Phleum 205, 207, 217, 219, pi. 17 

 Phragmites 59, 209, 217, 219-220, 



pi. 19 

 Phryma 69 

 Phyllites 163, 166 

 Physa 90-1 

 Physalis 62-3 

 Pilea 69 



Pimelea 163, 169 



Pinus 29, 164, 179, 188, 190, pL 13 



Pisidium 79 



Planera 168 



Planorbis 89-90 



Plantago 66 



Platanus 26, 30,/. 1, 68, pZ. 3, 5 



Pleurocera 91 



Poa 69, 209, 210, 217, 219, pi. 17 



Podalirius 47 



Podocarpus 164 



Podogonium 177 



Podophyllum 69 



Polanisia 62 



Polygala 64 



Polygonatum 



Polygonum 66, 68-9 



Polygyra 83-5, pL 10 



Polypteris 63 



Populus 68, 167-8, 185, 188, pi. 15 



Porana 170 



Potamogeton 58, 164 



Prosopis 43 



Prunus61, 63, 68, 178 



Pseudopanurgus (50) 



Psoralea 61-2, 64-5 



Pterocarya 175 



Punctum 85 



Pupa 86-7 



Pycnanthemum 46, 69 



Pyramidula 82 



Pyrus 68 



Quadrula 76-7 



Quercus 29, 66, 68-9, 167 



Ramalina 192, 196 



llanunculus 58, 69 



Redfleldia 62-3 



Rhamnus 68, 173, 183, 188, pi. 15 



Rhus 61, 68 (171) 175, 184, 188, 



pi. 12 

 Ribes 68 

 Riddellia 61 

 Robinia 178, pi. 8 

 Rosa 68, 176 

 Rubus 68 

 Rudbeckia 69 

 Ruppia 58 



Sabal 178 

 Sagittaria 69 



