56 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



Prairie-jiiue. i^t^e Lacmaria spicatu. 



Prenanthen alba L. Same as Nabalus nlbm. 



Prenanthes serpentaria Pursh. Same as Nabalus serpentarius. 



Prickly ash, northern. See Xanthoxylum nmericanum. 



Prickly ash, southern. See Fagara dava-herculis. 



Prideweed. See Erigeron canadensis. 



Prim. See Ligustrum imlgarS. 



Primrose, evening-. See Oenothera biennis. 



Primrose, tree-. See Oenothera biennis. 



Prim wort. See Ligustrum vulgar e. 



Prince' s-pine. See Chimaphila umbellata. 



Prinos reriicillatus L. Same as Ilex verticlllata. 



Privet. See Ligustrum rulgare. 



Prunella vulgaris L. Mint family (Mentliaceae). 



Self-heal; heal-all; brownwort; sicklewort; blue-curls. 



Perennial plant, 2 inches to 2 feet high, naturalized from Europe, and found 

 in fields, woods, and waste places throughout nearly the whole of North 

 America. 



Part used. — Herb (nonofficial). 

 Prunus serotina Ehrh. Plum family (Amygdalaceae). 



tSy 110111/ lit. — Prunus cirginiana Mill., not of Linnaeus. 



Prunus virginiana; wild cherry; rum-cherry. 



A large, indigenous tree, 50 to 80 feet high, growing in woods or open places from 

 Ontario to Florida, west to Texas and Dakota. Most abumlant in the South- 

 western States. 



Part used. — Bark, which should be collected in autumn and carefully dried and 

 preserved (official). 



Prunus virginiana. See Prunus serotina. 



Prunus virginiana. Mill., not L. Same as Prunus serotina. 



Psoralea. See Psoralea pedunculata. 



Psoralen melilotoides Michx. Same as Psoralea pedunculata. 



Psoralea pedunculata (Mill.) Vail. Pea family (Pabaceae). 



Synoni/rn. — Psoralea vielilotoides Michx. 



Psoralea; Samson's-snakeroot; Congo-root. 



Slender, herbaceous perennial, 1 to 2k feet high, native in dry soil in open woods 

 from Ohio and Kentucky southward. 



Parts used. — Root and leaves (nonofficial ). 



Ptelea trifoliata L. Rue family (Rutaceae). 



Wafer-ash; wingseed; hop-tree; shrubby trefoil. 



Native shrub, 6 to 8 feet high; in shady woods from New York to Florida, west 

 to Minnesota and Texas; grows more abundantly west of the Alleghenies. 



Parts used. — Bark of root, fruit, and leaves (nonofficial). 

 Pterocaulon undulatum (Walt.) Mohr. Aster family (Asteraceae). 



Sgnonym. — Gnuplialium undulatum Walt. ' 

 Indian blackroot. 

 Native, perennial herb, growing in sandy pine lands from North Carolina to 



Florida and Mississippi. . - 



Part used. — Root (nonofficial). 



Puccoon, red. See Sanguinaria canadensis. 

 Puccoon, yellow. See Hydrastis canadensis. 

 Pulsatilla, American. See Pulsatilla hirsutissima. 



