RHUS TOXICODENDRON RUBUS OCCIDENTALIS. 59 



Rhus toxicodendron L. Sumac family ( Anacardiaceae) . 



Poison-ivy; poison-oak. 

 Low, erect, and finely pubescent plant, more shrubby than Bhus radicans, and~ 



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



poisonous to the touch. 



I'art nsed. — Vresh leaves, collected with those of Rhus radicam. 

 Rich\\eed. See CoUlnsonia canadensis and Eupatorium ageratoidex. 

 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. 



Pari used. — Bark of root (nonofhcial). 



Kol)in's-rye. See PoJytrichuni juniperinum. 



Rock-brake. See Polypodium vidgare. 



Rock-rose, Canadian. See Helianthemum cauadense. 



Rope-bark. See Dirca palusti'is. » 



Rose, Canadian rock-. See Helianthemum cauademe. 



Rose-bay. See Rhododendron maximum . 



Rose-laurel. See Rhododendron maximum. 



Rosemary, marsh-. See Limonium. carolinianum. 



Rose-jjink. See Sabbatia angidaris. 



Rose-willow. See Cornus amomum. 



Rosin weed. See Silphium laciniatiwi. 



Roundwood. See Sorbus americana. 



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

 viUosus. 



Rt(bus m7iadnisisT. & G., not L. Same as Rubus procumhevs. 



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. 



Pari used. — Bark of rhizome (official). 



Ruhus idaeus var. americanus Torr. Same as Rubus occidenialis. 



Rubus nigrobaccus Bailey. Rose family (Rosaceae). 



Sijnonym. — 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) . 



Si/nonym. — 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) . 



