INDEX TO ORDERS AND GENERA. 



PAGE. 



Mercurialis 81 



Mertensia 64 



Microstylis 93 



Mikania 46 



Milium 123 



Mimulus 68 



Mitchella 44 



Mitella 34 



Mollugo 38 



Monarda 72 



Moneses 59 



Monotropa 60 



Morus 82 



Muhlenbergia 124 



Muscat! 100 



Myosotis 64 



Myrica 84 



M y r i c a c e ae 84 



Myriophyllutn 36 



Nabalus 55 



Naiadaceae 104 



Naias 104 



Nardosmia 53 



Nasturtium 11 



Neguudo 22 



Neillia 28 



Nemopanthes 19 



Nepeta 73 



Nesea 37 



Nicandra 67 



Nuphar 7 



Nympluea 7 



N y in p h se a c e a e 7 



Nyssa 42 



Oakesia 99 



Q^uothera 37 



Oleace ae 61 



Onagraceae 37 



Onopordou 54 



Onosmodium 65 



Orchidaceae 93 



Orchis 95 



Ornithogaluni 98 



Orobanchaceae 69 



Oryzopsis 123 



Osmorrhiza 39 



Ostrva 85 



Oxalis 19 



Panicum • . .120 



Papaver 7 



Papaveraceae 7 



Parietaria 82 



Parnassia 34 



Pastinaca 40 



Pedieularis 69 



Peltandra 102 



Penthorum 35 



Pentstemon 67 



Perularia 95 



Petasites 53 



Peucedanum 40 



Phalaris 123 



Phleum 124 



Phlox 63 



Phragmites 126 



PACK. 



Phryma 70 



IMiysalis 66 



Physostegia 73 



Phytolacca 76 



I'hytolaccaceae 76 



Picea 132 



Pilea 82 



Pimpinella 39 



Pinguicula 70 



Pinus 131 



Piperaceae 79 



Pirus 32 



P 1 a 11 1 a g i n a c e ae 74 



Plantago 74 



P 1 a t a n a c e ae 83 



Platanus S3 



Poa ij?8 



Podophyllum 6 



Pogonia 94 



Polanisia 12 



Polemoniaceae 63 



Polygala 14 



Polygalaceae 14 



Polygonaceae 76 



Polygonatum 98 



Polygonum 77 



Poutederia 100 



Pontederiaceae 100 



Populus 92 



Portulaca 16 



Portulacaceae 16 



Potamogeton 104 



Potentilla 30 



Poterium 31 



Prenanthes 55 



Primula 60 



P r i m u 1 a c e ae 60 



Prosartes 99 



Proserpinaca 36 



Prunus 27 



Pterospora 60 



Pycnanthemum 71 



Pyrola 60 



Quercus 85 



Ranunculaces . . . . 1 



Ranunculus 2 



Raphanus 12 



R h a m n a c e ae 20 



Rhamnus 20 



Rhexia 36 



Rhododendron 59 



Rhus 22 



Rhynchospora no 



Ribes 34 



Rohinia 24 



Rosa 31 



Rosaceae 27 



R u 1 ) i a c e ae 44 



Rubus 28 



Rudbeckia 51 



Rumex 76 



Rutaceae 19 



Sagittaria 103 



Salicaceae 87 



Salix S7 



