40 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



Jeffersonia diphylla (L. ) Perf^. Barberry family (Berberidaceae). 



Twinleaf; rheumatism-root; helmetpod; yellowroot; ground-squirrel pea. 



Native, perennial plant, 8 to 14 inches in height, growing in woods and near 

 streams from New York to Virginia, westward to Wisconsin. 



Part used. — Rhizome (nonofficial). 

 Jewelweed. See Impatiens aurea and I. h'ifora. 

 Jimson-weed. See Datura stramonium. 

 Job's-tears, wild. See Onosmodium. virginianum. 

 Joe-Pye-weed. See Eupatorium purpureum. 

 John's-wort. ^ee Hyperu-um perforatum. 

 Judas-tree. See Cercis canadensis. 

 .Tuglans. See Juglans cinerea. 

 Juglans cinerea L. Walnut family ( Juglandaceae). 



Juglans; butternut; white walnut. 



Indigenous tree, 20 to 50 feet in height, common in rich woods from New Bruns- 

 wick to North Dakota, south to Georgia, Mississijtpi, and Arkansas. 



Part used. — Bark of root, collected in autumn (official in U. S. P. 1890). 



Juniper. See Juniperus <'i»iimunis. 



Juniperus communis L. Pine family (Pinaceae). 



Juniper. 



Evergreen shrub or low tree, common on dry, sterile hills from Canada south 

 to New Jersey, west to Nebraska, and in the Rocky Mountains to New Mexico. 

 Part used. — Fruit (nonofficial). The oil of juniper, distilled from the fruit, is 

 official. 



Juniperus sabina L. Pine family (Pinaceae ). 



Sabina; savin; shrubby red cedar. 



A shrub, usually procumbent, seldom more than 4 feet in height, occurring i4i 

 rocky places in the northern United States. 



Part used. — Tops, and the oil of savin, distilled from the fresh tops, are official. 

 Juniperus virginiana L. Pine family (Pinaceae). 



Red cedar; red savin. 



A tree, sometimes 100 feet in height, connnon in dry soil from Canada to Florida 

 and Arizona. 



Parts used. — Leaves and "cedar apples" (nonofficial). 



Kalmia angustifolia L. Heath family (Ericaceae). 



Sheep-laurel; lambkill; calfkill; narrow-leaved laurel. 



Native, evergreen shrub, about 3 feet high, growing in moist soil from Canada 

 south to Georgia. 



Part used. — Leaves (nonofficial). 

 Kalmia latifolia L. Heath family ( Ericaceae "l. 



Mountain-laurel; calico-bush; broad-leaved laurel; sheep-laurel. 



Native, evergreen shrub, 10 to 20 feet high, growing in sandy or rocky soil 

 from New Brunswick to Ohio, Florida, and Louisiana. 



Part used. — Leaves (nonofficial). 



Kidney-liverleaf. See Hepatica hepatica. 

 Kidneyroot. See Eupatorium purpureum. 

 Knight' s-spur. See Delphinium consolida. 

 Knobroot. See CoUinsonia canadensis. 

 Knotweed, biting. See Polygonum hydropiper. 



