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(so͞o′măk, sho͞o′-)
1. Any of various shrubs or small trees of the genera Rhus and Toxicodendron, having compound leaves, clusters of small greenish flowers, and usually red, hairy fruit. Species in the genus Toxicodendron, such as poison sumac, have toxic sap.
2. A tart, dark reddish-brown powder made from the ground dried fruits of a Eurasian sumac (Rhus coriaria), used as a seasoning in Middle Eastern cuisine.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

Patient discussion about sumac

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,

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References in periodicals archive ?
Out of the remaining 19 specimens, Aronia arborea, Ibex verticulata, Rhus aromatica, Thuja occidentalis, Tsuga canadensis, and Viburnum dentatum had an average decrease in size.
Botanical Name: Common Name: Acer rubrum Red Maple Aronia arborea 'brilliantissima' Red Chokeberry Clethra alnifolia Summer Sweet Diervilla sessilifolia Summer Stars Honeysuckle Fraxinus pennsylvanica Patmore Ash Hammamelis virginiana Witchazel Ilex verticulata Winter Red Holly Itea virginiana Virginia Sweetspire Magnolia virginiana Sweetbay Magnolia Myrica pennsylvanica Northern Bayberry Rhus aromatica Fragrant Sumac Salix purpurea Arctic Willow Thuja occidentalis Emerald Arborvitae Tsuga canadensis Canadian Hemlock Viburnum dentatum Chicago Luster Viburnum Table 3 Approximate costs of irrigation, pump, and winterizing equipment and installation as compared to a treatment and storage pond or a holding tank with regular pumping over the winter.
- To document the presence or absence of a persistent soil seed bank in Rhus aromatica and in R.
- For Rhus aromatica 35 seed traps (34 x 34 cm) made with wire netting (1.44 x 1.44 mm) were nailed to the ground directly beneath canopies of fruiting plants on 13 June 1994, when most fruits had just turned mature-red.
- For Rhus aromatica 47 [+ or -] 2% and 33 [+ or -] 5% (P [greater than] 0.05) of the seeds remained impermeable after burial in the field for 1 and 2 y, respectively.
- Emergence of Rhus aromatica seedlings occurred in all seasons that the first-year seeds were in the unheated greenhouse.