POLYPODIUM VULGARE POTENTILLA CANADENSIS. 55 



Polypodium vulgare L. ♦ Fern family (Polypodiaceae). 



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. 

 Poly trichum juniper inum Hedw. Haircap-moss family (Polytrichaceae). 



Haircap-rnoss; robin' s-rye. 



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

 exposed places, mostly on poor, sandy soil. 



Part used. — Whole plant (nonofficial). 

 Pond-lily, large yellow. See Nymphaea advena. 

 Pond-lily, white. See Castalia odorata. 



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

 Poolwort. See Eupatorium ageratoides and E. aromaticum. 

 Poplar, silver. See Populus alba. 

 Poplar, silverleaf-. See Popidus alba. 

 Poplar, trembling. See Popidus tremidoides. 

 Poplar, tulip-. See Liriodendron tulipifera. 

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

 Poplar, yellow. See Liriodendron 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 balsamifera 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. — Leaf buds and bark (nonofficial) . 

 Populus tremuloides Michx. Willow family (Salicaceae). 



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



A slender, indigenous tree, growing in dry or moist soil from lower Canada south 

 to Kentucky and in the Rocky Mountains to Lower California. 



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

 Porter anthus trifoliatus (L. ) Britton. Rose family ( Rosaceae ) . 



Synonym. — Gillenia trifoliata Moench. 



Indian-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 Ipomoea pandurata. 

 Potato, wild. See Ipomoea pandurata. 

 Potentilla canadensis L. Rose family (Rosaceae). 



Fivefinger; cinquefoil. 



A small, annual or biennial plant, with creeping stems, growing in dry soil from 

 Quebec to Georgia, west to Minnesota and the Indian Territory. 



Part used. — Plant (nonofficial). 



