ii8 



Index 



Phalaris i6 



Phanerogamae, di\dsion 8 



Phegopteris 6 



Phleum 17 



Phragmites 18 



Phyllodoce 82 



Phyllodoceae, tribe 82 



Physospermum 77 



Physurinae, subtribe 32 



Phyteuma 103 



Phytolaccineae, suborder 42 



Picea 9 



Picris 109 



Pilularia 7 



Pimpinella 78 



Pinaceae, family 9 



Pinguicula 98 



Pinus 10 



Pirola (including Moneses) 81 



Pirolaceae, family 80 



Piroloideae, subfamily 81 



Pirus 58 



Plantaginaceae, family 98 



Plantaginales, order 98 



Plantago 98 



Platanaceae, family 56 



Platanus 57 



Pleonandrae (Diandrae), subfamily 



30 



Plumbaginaceae, family 85 

 Plumbaginales, order 84 

 Plumerieae, tribe 87 

 Plumerioideae, subfamily 87 

 Poa 19 



Poeoideae, subfamily 16 

 Polemoniaceae, family 88 

 Polemonieae, tribe 89 

 Polemonioideae, subfamily 89 

 Polemonium 89 

 Polycarpeae, tribe 43 

 Polycarpon 43 

 Polygala 63 

 Polygalaceae, family 63 

 Polygalineae, suborder 63 

 Polygonaceae, family 39 

 Polygonales, order 39 

 Polygonateae, tribe 27 

 Polygonatum 27 

 Polygoneae, tribe 40 

 Polygonoideae, subfamily 39 

 Polygonum (including Fagopyioim) 

 40 



Polypodiaceae, family 5 

 Polypodieae, tribe 7 

 Polypodium 7 

 Polypogon 1 7 

 Polystichum 6 

 Pomoideae, subfamily 58 

 Populus 34 

 Portulaca 42 

 Portulacaceae, family 42 

 Portulacineae, suborder 42 

 Potamogeton 1 2 

 Potamogetonaceae, family 1 1 

 Potamogetoneae, tribe 12 

 Potamogetonineae, suborder 11 

 Potentilla 58 

 Potentilleae, tribe 58 

 Poterium 59 

 Pothoideae, subfamily 22 

 Primula 83 

 Primulaceae, family 83 

 Primulales, order 83 

 Primulinae, subtribe 83 

 Prunoideae, subfamily 59 

 Prunus 59 



Pseudosolanoideae, subfamily 95 

 Pseudotsuga 9 

 Pterideae, tribe 6 

 Pteridinae, subtribe 7 

 Pteridium {— Pteris) 7 

 Pteridophyta, subdivision i 

 Pteris 7 

 Pulicaria 105 

 Pulmonaria 90 



Quercus 36 



Radiola 63 



Ranales, order 45 



Ranunculaceae, family 46 



Ranunculineae, suborder 46 



Ranunculus 48 



Raphaneae (Lomentaceae ortho- 



plocae), tribe 53 

 Raphanus 53 

 Reseda 54 



Resedaceae, family 54 

 Resedineae, suborder 53 

 Rhamnaceae, family 67 

 Rhamnales, order 67 

 Rhamneae, tribe 67 

 Rhamnus 67 

 Rheum (including Oxyria) 39 



