Metzgeria 23 



Micrampells 173 



MIcrOEtylls 72 



See Acroanthes 72 



Milium 35 



Mlmulus 164 



Mltchella 169 



Mitella 108 



Mnium 20 



Mochringia 92 



MoUugo 88 



Monarda 159 



Moneses 143 



Monocotoledonea 27 



Monotropaceae 144 



Monotropa 144 



Moracese 81 



Morus 81 



Muhlenbergla 35 



Muscari 64 



MyUa 23 



Myosotis 154 



Myriacese 75 



Myrica 75 



Myriophyllum 137 



Nabalus 177 



Prcnanthes 177 



Naidacese 28 



Nalas 30 



Nardia 23 



Naumbergia 147 



Lysamachia 147 



Neckera 20 



Nepeta 157 



Neslia 104 



Nessea 134 



See Decodon 134 



Nicotlana 163 



Nymphaeaceae 93 



Nymphsea 93 



Nyssa 143 



Odontoschisma 23 



Oneothera 136 



See Onagra 136 



And Kneiffla 136 



Oleaceae 148 



Onagraceae 135 



Onagra 136 



Onoclea 9 



Onosmodium 155 



Onothera 136 



Ophioglossaceae 7 



Ophioglossum 7 



Orchidacese 68 



Orchis 69 



Origanum 160 



Ornithogalum 64 



Orobanchacese 167 



Orontlum 58 



Orthotrlcum 20 



Oryzopsis 35 



Osmorrhica 140 



See Washlngtonia 140 



Osmundacese 8 



Osmunda 8 



Ostrya 78 



Oxalidacese 121 



Oxalls 121 



Oxycoccus 146 



Oxygraphls 98 



Ranunculus 98 



OxypoUs 138 



Tiedemania 138 



Pallavicinia 23 



Panax 138 



Aralia 138 



Panlcularla 41 



Glyceria 41 



Panicum 33 



Panicum 32 



See Syntherisma 32 



Papaveraceee 99 



Papilinacese 116 



Parthenoclssus 129 



Parnassia log 



Pastinaca 139 



Pellea 14 



PelUa 23 



Peltandra 53 



Penthorum 107 



Pentstemon 164 



Peramlum 72 



Goodyera 72 



Petasites 191 



Phaca 118 



Phacelia 153 



Phalarls 34 



PhaseoUs 121 



Phegopteris n 



Phllonotla 20 



Phllotrla 32 



Phleum 36 



Phlomls 158 



Phlox 152 



Phragmites 39 



Phrymacess I6S 



Phryma 168 



Phyllitls 12 



Scallopendrium 12 



Physalls 162 



Physostegia 168 



Phytolacacese 87 



Phytolacca 87 



Picea 25 



Abies 26 



Picnanthemum 160 



See Kellla 160 



Pimplnella 140 



Zizia 140 



Pinacese 25 



Plnus 25 



Plaglochlla 24 



Plagiothecium 20 



PlantaglnaceEB 168 



Plantago 168 



Platanaceae 109 



Platanus 109 



Pluchea 186 



Poa 40 



Podophyllum 99 



Pogonla 70 



Polanlsla 106 



Polemoniaceae 152 



Polemonium 152 



Polygalaceffi 122 



Polygala 122 



Polygonacese 82 



Polygonatum 66 



Polygonella 85 



Polygonum 83 



Polymnla 187 



Polypodlacese 9 



Polypodlum 14 



Polystlchum 11 



Polytrlchum 21 



Pomacese 113 



Pontederiaceae 60 



Pontederia 60 



Populus 75 



Porella 24 



PortulacaceSB 88 



Portulacea 88 



Potamogeton 28 



Potentllla Ill 



Pottla 21 



Prelssla 24 



Prenanthes 177 



See Nabulua 11 



PrimulacesB 146 



Prosperlnaca 137 



Prunella 158 



Brunella 168 



Prunus IIB 



Psllocarya 46 



Pterls IS 



Ptlllldlum 24 



Ptychomltrium 21 



Puccinella 42 



