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a genus of trees and shrubs, many of them poisonous. Contact with certain species produces a severe dermatitis in sensitive individuals. The most important poisonous species are R. diversilo´ba and R. toxicoden´dron, or poison oak, R. ra´dicans, or poison ivy, and R. ver´nix, or poison sumac. Most species of Rhus are sometimes classified in the genus Toxicodendron. See also poison ivy, oak, and sumac.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


(rūs, rŭs),
A genus of vines and shrubs (family Anacardiaceae) containing various species that are used for their ornamental foliage; formerly used in tanning. Certain poisonous species are classified as Toxicodendron.
[L., fr. G. rhous, sumac]
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Patient discussion about Rhus

Q. is poison ivy or sumac contagious

A. if you scratch the rash and it has open sores,the pus from the sores can spread to other parts of the body and to other people as well,

More discussions about Rhus
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References in periodicals archive ?
In 2009, we collected several galls formed by an aphid species feeding on Rhus hypoleuca Champion ex Bentham in China.
Jeon et al., "Flavonol-rich RVHxR from Rhus verniciflua Stokes and its major compound fisetin inhibits inflammation-related cytokines and angiogenic factor in rheumatoid arthritic fibroblast-like synovial cells and in vivo models," International Immunopharmacology, vol.
Many researchers have reported that Rhus verniciflua Stokes possesses an anti-inflammatory effect by modulating the expression of proinflammatory mediators.
A similar RCT from a dermatology clinic of 10 adults with confirmed sensitivity to poison oak or ivy found that topical jewelweed extract didn't improve symptoms of artificially induced Rhus dermatitis.
Pallets of Rhus coriaria from Jordan were analyzed through X- ray fluorescence which showed the presence of Ti, Cu, Fe, Al, Cl, P, K, Mn, Ca, Zn, Si, Br, S, and Sr in different quantities (Barakat et al., 2003).
Botanically, Rhus natalensis is a shrub 2-3 m high or a small tree up to 8 m tall; bark of the branchlets greyish or white and older ones dull grey, lenticillate and rough.
These include Rhus radicans (also poison ivy), Rhus venenata (poison elder or swamp sumac), Mangifera (mango), Anacardium (marking nut), Comocladia (guao), and Rhus glabra (smooth sumac).
El subgenero Lobadium del genero Rhus posee alrededor de 25 especies, que se distribuyen principalmente en Mexico.
If you want to make a statement in autumn with some dazzling foliage, look no further than the rhus, a shrub which bears the most sizzling colours in its palm-like leaves, which turn yellow, orange or purple.
IF YOU want to make a statement in autumn with some dazzling foliage, look no further than the rhus, a shrub bearing the most sizzling colours as its palm-like leaves turn yellow, orange or purple.