56 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



Prairie-pine. See Lacinaria spicata. 



Prenanthes alba L. Same as Nabalus aU 



Prenanthes serpentaria Pursh. Same as Nabalus serpentarius. » 



Prickly ash. northern. See Xanthoxylum americanum. 

 Prickly ash. southern. See Fagara clava-herculis. 

 Prideweed. See Erigeron canadensis. 

 Prim. See Ligustrum vulgare. 



Primrose, evening-. See Oenothera biennis. 

 Primrose, tree-. See Oenothera biennis. 

 Primwort. See Ligustrum vulgare. 

 Prince' s-pine. See Chimaphila umbellata. 

 Prinos verUcUlalus L. Same as Hex verticiUata. 

 Privet. See Ligustrum vulgare. 



Prunella vulgaris L. Mint family Menthaceae). 



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 u.<ed. — Herb (nonofficial). 

 Prunus serotina Ehrh. Plum family Amyg-dalaceae i . 



Synonym. — Prunus virginiana Mill., not of Linnaeus. 

 Prunus virginiana; wild cherry: rum-cherry. 



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

 Ontario to Florida, west to Texas and Dakota. Most abundant 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 Psoralen pedunculata. 



Psoralea melUotoides Michx. Same as Psoralea pedunculata. 



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



Synonym. — Psoralea melUotoides Michx. 



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



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

 from Ohio and Kentucky southward. 



Parts used. — Eoot and leaves i nonofficial . 

 Ptelea trifoliata L. Rue family Rutaceaei. 



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



Xative shrub, 6 to S feet high; in shady woods from 2s ew 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 undulatuni Walt. ) Mohr. Aster family Asteraceae . 



Synonym. — Gnaphalium undulatum Walt. 



Indian blackroot. 



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

 Florida and Mississippi. 



Part used. — Root (nonoffici: 

 Puccoon, red. See Sanguinaria canadensis. 

 Puecoon. yellow, See Hydrastis canadt 

 Pulsatilla. American. See Pulsatilla hirsutissima. 



