OXALIS ACETOSELLA PENNYROYAL, AMERICAN. 51 



Oxalis acetosella L. Wood-sorrel family (Oxalidaceae). 



White wood-sorrel; snamrock; sour trefoil. 



Small, native, perennial herb, found in cold, damp woods, Canada south to 

 Michigan and North Carolina. 



Part used. — Herb (nonofficial). 

 Oxeye daisy. See Chrysanthemum leucanthemum. 

 Oxydendrum arboreum (L. ) DC. Heath family (Ericaceae). 



Synonym. — Andromeda arborea L. 



Sourwood; sorrel-tree; elk-tree. 



Native tree, sometimes 40 to 50 feet in height, growing in rich woods from Ohio 

 to Maryland, south to Alabama and Florida. 



Parts used. — Leaves and bark (nonofficial) 



Palmetto, saw-. See Serenoa serrulata. 



Panax quinquefolium L. Ginseng- family (Araliaceae). 



Ginseng. 



Native, perennial herb, about 1 foot in height, found in rich, shady woods 

 from the Middle and Northern States south to Alabama and Georgia. 



Part used. — Root (nonofficial). 

 Pansy. See Viola tricolor. 

 Papoose-root. See Caulophyllum thalictroides. 



Paradise-plant. See Daphne mezereum. . ■ 



Parilla, yellow. See Menispermum canadense. 

 Parsley, spotted. See Conium maculatum. 

 Parsley-fern. See Tanacetum vulgare. 

 Parsnip, cow-. See Heracleum lanatum. 

 Parthenocissus quinquefolia (L. ) Planch. Grape family (Vitaceae). 



Synonym. — Ampelopsis quinquefolia Michx. 



American ivy; Virginia creeper. 



A common, woody vine, native in woods and thickets from Canada to Florida 

 and Texas. 



Parts used. — Bark and young twigs (nonofficial). . 

 Partridgeberry. See Mitchella repens. 

 Pasqueflower, American. See Pulsatilla hirsutissiina. 

 Passiflora incarnata L. Passion-flower family (Passifioraceae). 



Passion-flower; passion-vine; may-pops. 



Climbing, perennial plant, native in dry soil from Virginia to Florida, westward 

 to Missouri and Arkansas. 



Parts used.— Root and stem base (nonofficial). 

 Passion-flower. See Passiflora incarnata. 

 Passion-vine. See Passiflora incarnata. 

 Paul's-betony. See Veronica officinalis. 

 Pawpaw, North American. See Asimina triloba. 

 Pea, ground-squirrel. See Jeffersonia diphylla. 

 Pea, hoary. See Cracca virginiana. 

 Pea, turkey-. See Bikukulla canadensis. 

 Pearl-plant. See Onosmodium virginianurn . 

 Pencil-flower. See Stylosanthes bi flora. 

 Pennyroyal, American. See Hedeoma pulegioides. 



