Papilionaceae, 
Pardanthus, 
Parietaria, 
Parnassia, 
Parnassieje, 
Paronychia, 
Parsley Family , 
Paspalum, 
Passi flora, 
PASSIFLORACEjE, 
Pastinaca, 
Pea Tribe, 
Pear Family, 
Pedicularis, 
Pellia, 
Peltandra, 
Penthorum, 
Pentstemon, 
Peplis, 
Periploca, 
Persica, 
Petalosteraon, 
Phaca, 
Phacelia, 
Phalaris, 
Phascum, 
Phaseolus, 
Phleum, 
Phlomis, 
Phlox, 
Phragmites, 
Phryma, 
Phyllanthus, 
Phyllodoce, 
Phyllogonium, 
Physalis, 
Physcomitrium, 
Physostegia, 
Phytolacca, 
PhYTOLACCACEAI, 
Pickerel-weed Family, 
Pi lea, 
Pilinophytum, 
Pine Family , 
Pinguicula, 
Pink Family , 
Pipewort Family , 
Piptatherum, 
Pisum, 
Pitcher-plants , 
Plagiocnila, 
Plane-tree Family , 
Plantagiracea:, 
Plantago, 
Plantain Family , 
INDEX. 
707 
91 Platanace^:, 
483 Platanthera, 
437 Platanus, 
50 Platyloma, 
50 Pluchea, 
65 PtlTMBAGINACEJE, 
153 
610 
143 
143 
158 
93 
128 
310 
684 
446 
147 
2981 
55 
371 
115 
105 
103 
342 
608 
645 
95 
574 
332 
344 
601 
312 
407 
267 
678 
354 
648 
329; 
385 
385 
509 1 
436, 
408; 
438 
288 : 
55j 
514 
584; 
95: 
24 
695; 
433 
278. 
278| 
278 ; 
Poa, 
Podophyllum, 
Po DO STEM ACE AS, 
Podostemum, 
Pogonatum, 
Pogonia, 
Pohlia, 
Pokeweed Family , 
Polanisia, 
PoLEMONIACEjE, 
Polemonium, 
Polemonium Family , 
Polygala, 
PoLl'GALACEA, 
Polygonacea:, 
Polygonatum, 
Polygonum, 
Polymnia, 
Polypodium, 
Polystichum, 
Polytaenia, 
Polytrichum, 
Pomeje, 
Pondweed Family , 
Pontederia, 
Pontederiacea;, 
Poppy Family , 
Populus, 
Portulaca, 
POBTDLACACEA, 
Potamogeton, 
Potentilla, 
Poterium, 
Pottia, 
Primrose Family, 
Primula, 
Pbimdlacea:, 
Prinos, 
Prosartes, 
Proserpinaca, 
Prunella, 
Prunus, 
Psilocarya, 
Psoralea, 
Ptelea, 
Pteris, 
Pterogonium, 
Pterospora, 
Ptilidium, 
433 
469 
433 
624 
216 
279 
595 
21 
403 
403 
658 
473 
661 
385 
42 
343 
343 
343 
87 
87 
385 
490 
386 
218 
622 
632 
157 
659 
128 
451 
509 
509 
25 
430 
66 
66 
454 
121 
118 
647 
280 
281 
280 
276 
498 
139 
326 
114 
531 
105 
78 
624 
664 
274 
688 
