58 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



Rattlesnake-master. Bee Eryngium yuccifoliumj Lacinaria scariosa, L. spicata, and 

 L. squamosa* 



Rattlesnake-plantain, downy. See Peramium pubescens. 



Rattlesnake-plantain, lesser. See Peramium repens. 



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



Rattlesnake-violet. See Erythronium americanuin. 



Rattlesnake-weed. See Eryngium yucdfoliwm ) Hieracium venmum, and Per&ptium 



jtlll'i smfs. 



Redbud. See Cere!* canadensis. 



Uedroot. See Ceanothut americanus. 



Ehamnus cathartica L. Buckthorn family (Rhamnaceae). 



Buckthorn; hart' s-t horn; waythoni. 



A shrnb 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 Rhamnm purshiana DO. 



Rhamnus purshiana IK'. * . Buckthorn family (Rhamnaceae). 



Rhanmus 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 tin- Pacific Ocean, and extending north 

 into British America. 



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

 Rheumatism-root. See Dioecorea viMosa and Jeffersonia diphylla. 

 Rheumatism-weed. See Chimaphila wmbeUata. 



Rhododendron maximum L. Heath family (Ericaceae), 



(heat 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. 



Pari m d. — 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 *hrub, from 4 to 12 feet high; in dry soil, thickets, and 

 waste grounds nearly throughout the United States and Canada. 



Park "W.— Fruit (official! ; bark and leaves < nonofficial). 



Rhus radicans L. a Sumac family (Anacardiaceae) . 



Rhus toxicodendron (pharmacopoeia] name, ] >0); poison-ivv; poison-oak; 



poison-vine. 



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



to Nebraska and Arkansas. Very poisonous to the touch. 



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



Rhus toxicodendron. See Rhus radicans. 



'i Rhus rod h. was formerly believed t<> he a varied i Ek\ taricodt ndt L but the two are 



now regarded as lisiinet species, and the Leaves from both have been used under the pharmacoixeia] 

 name (V. s. P. i >) Rhus toxicodendron. 



