58 WILD MEDICIKAL PLANTS OF THE FXITED STATES. 



Rattlesnake-master. See Eryngium yuccifolium, iMcinaria scariosa, L. spicata, and 

 L. squamosa. 



Rattlesnake-plantain, downy. See Peramium pubescens. 



Rattlesnake-plantain, lesser. See Peramium repens. 



Rattlesnake-root. See Nabalus alios and N. serpentarius. 



Rattlesnake-violet. See Eryihronium americanum. 



Rattlesnake-weed. See Eryngium yuccifolium, Hieracium venosum, and Peramium 

 - pubesa ns. 



Redbud. See Cercis canadensis. 

 Redroot. See Ceahothus americanus. 



Rhamnus cathartica L. Buckthorn family (Rhamnaceae). 



Bnekthorn; hart's-thorn; waythorn. 

 A shrub 6 to 15 feet high, introduced from Europe; escaped from hedges and 



growing in dry soil in the New England and Middle States. 

 Part used. — Berries (nonofficial). 

 Rhamnus purshiana. See Rhamnus purshiana DC. 



Rhaninus purshiana DC. Buckthorn family (Rhamnaceae |. 



Rhamnus purshiana: cascara sagrada; chittem-bark; sacred-bark: bearberry-tree. 

 Small, indigenous tree, 15 to 20 feet in height, found on the sides and bottoms 

 of canyons, Rocky Mountains west to the Pacific Ocean, and extending north 

 into British America. 

 Part used. — Bark, collected at least one year before being used (official). 

 Rheumatism-root. See Dioscorea uillosa and Jeffersonia diphylla. 

 Rheumatism-weed. See ChimaphUa umbellata.. 



Rhododendron maximum L. Heath family Ericaceae). 



Great laurel; rose-bay; deer-laurel; rose-laurel. 

 Tall, native, evergreen shrub or small tree, found in low woods and along streams 



from Canada to Georgia. 

 Part used. — Leaves (nonofficial). 

 Rhus aromatica Ait. Sumac family (Anacardiaceae . 



Fragrant sumac; sweet-scented sumac. 



Indigenous shrub, 2 to 6 feet high, growing in woods and rocky situations, 

 Canada to Florida, especially along the mountains, west to Minnesota and 

 Arkansas. 

 Part used.- — Bark of root (nonofficial). 

 Rhus glabra. See Rhus glabra L. 



Rhus glabra L. Sumac family (Anacardiaceae . 



Rhus glabra; smooth sumac; scarlet sumac. 

 Indigenous, branching shrub, from -4 to 12 feet high; in dry soil, thickets, and 



waste grounds nearly throughout the United States and Canada. 

 Parts used. — Fruit (official) : bark and leaves (nonofficial). 

 Rhus radicans L. « Sumac family | Anacardiaceae ) . 



Rhus toxicodendron ( pharmacopceial name, 1890); poison-ivy: poison-oak: 



poison- vine. 

 Xative, woody vine, clinging to trees and fence rows; Canada to Florida, west 



to Nebraska and Arkansas. Very poisonous to the touch. 

 Part used.— Fresh leaves (official in U. S. P. 1890). 

 Rhus toxicodendron. See Rhus radicans. 



a It/<u$ radicans L. was formerly believed to be a variety of Ithas toxicodendron L.. but the two are 

 now regarded as distinct species, and the leaves from both have been used under the pharmacopoeia! 

 name (U. S. P. 1890 1 Rhus toxicodendron. 



