18 FERNS AND 



P. 



PANAX, L. ginseng. 



quinquefolium, L. 

 PANICUM, L. panicgrass. 



crusgalli, L. barnyard grass. 



latifolium, L. 



proliferum, Lam. 



capillare, L. 



sanguinale, L. fingergrass; crab grass. 

 PARIETARIA, Tourn. pellitory. 



pennsylvanica, Muhl. American pellitory. 

 PASSIFLORA, L. passion flower. 



lutea, L. yellow passion flower. 

 PEDICULARIS, Tourn. lousewort. 



canadensis, L. common lousewort; wood betony. 



PENTHORUM, Gronov. ditch stone-crop. 



sedoides, L. 

 PENTSTEMON, Mitchell 



pubescens, Solander. beard-tongue. 

 PRINOS, L. winter berry. 



verticillatus, L. false alder. 

 PHACELIA, Juss. 



bipinnatifida, Michx. 



purshii, Backley. Miami mist. 

 PHALARIS, L. wild ribbon grass. 



americana, L. 

 PHASEOLUS, L. kidney bean. 



diversifolius, Pers. lobed bean-vine. 

 PHLOX, L. 



maculata, L. spotted lychnidea. 



glaberrima, L. Ohio lychnidea. 



divaricata, L. early flowering lychnidea. 



paniculata, L. 

 PHYRMA, L. lopseed. 



leptostachya, L. 

 PHYTOLACCA, Tourn. pokeweed. 



decandra, L. 



PHYSALIS, L. ground cherry. 



viscosa, L. 

 PILE A, Lindlay. 



pumila, L. stingless nettle. 

 PLANTAGO, L. plantain. 



major, L. common plantain. 



lanceolata, L. ribwort. 



