RHUS TOXICODENDRON RUBUS OCCIDENTAL1S. 59 



Rhus toxicodendron L. Sumac family (Anacardiaceae) . 



Poison-ivy; poison-oak. 



Low, erect, and finely pubescent plant, more shrubby than Rhus radicans, and 

 found in dry soil in more southern localities from Virginia to Georgia. Very 

 poisonous to the touch. 

 • Part used. — Fresh leaves, collected with those of Rhus radicans. 

 Rich weed. See Collinsonia canadensis and Eupatorium ageratoides. 

 Robinia pseudacacia L. Pea family (Fabaceae) . 



Locust-tree; black locust; yellow locust; false acacia. 



A large, indigenous tree, sometimes 80 feet in height, growing in woods from 

 Pennsylvania south along the western slope of the Allegheny Mountains to 

 Georgia, west to the Indian Territory. Most abundant in the Middle and 

 Eastern States. 

 Part used. — Bark of root (nonofficial). 

 Robin ' s-ry e . See Polytrichum juniperinum . 

 Rock-brake. See Polypodium vulgare. 

 Rock-rose, Canadian. See Helianthemum canadense. 

 Rope-bark. See Dirca palustris. 



Rose, Canadian rock-. See Helianthemum canadense. 

 Rose-bay. See Rhododendron maximum. 

 Rose-laurel. See Rhododendron maximum. 

 Rosemary, marsh-. See Limonium carolinianum. 

 Rose-pink. See Sabbatia angularis. 

 Rose-willow. See Cornus amomum. 

 Rosin weed. See Silphhim laciniatum. 

 Round wood. See Sorbus americai la. 



Rubus. See Rubus cuneifolius, R. nigrobaccus, R. procumbens, R. trivialis, and R. 

 villosus. 



Rubus canadensis T. & G., not L. Same as Rubus procumbens. 



Rubus cuneifolius Pursh. Rose family (Rosaceae). 



Rubus; sand-blackberry; knee-high blackberry. 



Shrubby plant, 1 to 3 feet high; in sandy soil from Connecticut to Florida, 

 west to Missouri and Louisiana. 



Part used. — Bark of rhizome (official). 

 Rubus idaeus var. americanus Torr. Same as Rubus occidentalis. 

 Rubus nigrobaccus Bailey. Rose family (Rosaceae). 



Synonym. — Rubus villosus A. Gray, not Ait. 



Rubus; high-bush blackberry. 



Slender shrub, 3 to 7 feet high, growing in dry fields and along roadsides, New 

 England States to Florida, and west to Arkansas. 



Part used. — Bark of rhizome (official). 

 Rubus occidentalis L. Rose family (Rosaceae) . 



Synonym. — Rubus idaeus var. americanus Torr. 



Black raspberry; thimbleberry; blackcap. 



A straggling shrub, growing along the borders of woods and in rocky thickets 

 from Canada south to Georgia and Missouri. 



Parts used. — Fruit and leaves (nonofficial) . 



