POLYPODIUM VOLGAKE POTENTILLA CANADENSIS. 55 



Polypodium vulgare L. Fern family (Polypodiaeeae). 



Common polypody; fernroot; rock-brake; female-fern. 



Native fern, 3 to 10 inches in height, with a perennial, creeping rhizome; on 

 shady, rocky banks, in woods and mountains almost throughout North 

 America. 



Parts used.— Rhizome and tops (nonofficial). 

 Polypody, common. See Polypodium vulgare. 



Polytrichum juniperinum Hedw. Haircap-moss family (Polytrichaceae). 



Haircap-moss; robin's-rye. 



Native moss, 4 to 7 inches in height, growing along margins of dry woody and 

 exposed places, mostly on poor, sandy soil. 



Part used. — Whole plant (nonofficial). 

 Pond-lily, large yellow. See Nympkaea advena. 

 Pond-lily, white. See < 'astalia odorata. 



Poolroot. See Eupatorium ageratoides, E. aromaticum, and Scaiicufa marilandica. 

 Poolwort. See Eupatorium ageratoides and E. aromaticum. 

 Poplar, silver. See Populus alba. 

 Poplar, silverleaf-. See Populus alba. 

 Poplar, trembling. See Populus tremuloides. 

 Poplar, tulip-. See Iiriodendron tuiipifera. ' 

 Poplar, white. See Populus alba and P. tremuloides. 

 Poplar, yellow. See Lbrbtfendron tulipifera. 



Populus alba L. Willow family (Salicaceae). 



White poplar; silverleaf-poplar; silver poplar; white-bark. 



A large tree, sometimes 120 feet in height, naturalized in the United States; 

 occurs along roadsides from New Brunswick to Virginia. 



Part used. — Bark, collected in spring (nonofficial). 

 Populus balsamifera candicans A. Gray. Same as Populus candicans. 

 Populus candicans Ait. Willow family (Salicaceae). 



Synonym. — Populus balsarnifera candicans A. Gray. 



Balm-of-Gilead. 



A large tree, about 80 feet in height, mostly escaped from cultivation, New- 

 Brunswick to New Jersey, west to Minnesota. 



Parts used. — Leafbuds and bark (nonofficial). 



Populus tremuloides Michx. Willow family (Salicaceae). 



Quaking aspen; American aspen; white poplar; trembling poplar; quiverleaf. 



A slender, indigenous tv^e, growing in dry or moist soil from lower Canada south 

 to Kentucky and in the Rocky Mountains to Lower California. 



/'art used. — Bark, collected in spring (nonofficial). 

 Porteranthus trifoliatus (L.) Britton. Rose family (Rosaceae). 



Synonym. — CKtten ia trifoliate Moench. 



I n< Han-physic; Bowman' s-root; false ipecac; western drop wort. 



Native, perennial herb, 2 to 3 feet high, found in moist, shady places in rich 

 woods from New York to Michigan, south to Georgia and Missouri; more 



common in the Atlantic States than in the Western States. 



Part used. — Root (nonofficial). 

 Potato, hog-. See rpomoea pandurata. 

 Potato, wild See Ipomoea pandurata. 



Potentilla canadensis L. Bose family | Rosaceae). 



y Fivetinger; cinq uef oil. 



A small, annual or biennial plant, with creeping stem-, l' rowing in dry soil from 

 Quebec to Georgia, west to Minm >ta and the Indian Territory. 



Part used. — Plant (nonofficial). 



