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poison ivy

(Encyclopedia)poison ivy, poison oak, and poison sumac, woody vines and trailing or erect shrubs of the family Anacardiaceae (sumac family), native to North America. They are sometimes considered as several specie...

Huntsville, town, Canada

(Encyclopedia)Huntsville, town, SE Ont., Canada, on the Muskoka River. It has lumber mills and a woodworking plant, but it is sustained mainly by its year-round touri...

Port Hope

(Encyclopedia)Port Hope, town (1991 pop. 11,505), SE Ont., Canada, on Lake Ontario, E of Toronto. It has a large plant for refining uranium ore and is a summer resort. ...

Yorkton

(Encyclopedia)Yorkton, city (1991 pop. 15,315), SE Sask., Canada, NE of Regina. It is a railroad center and has large stockyards, warehouses, a flour mill, brick and cement plants, and a farm-implement plant. ...

nastic movement

(Encyclopedia)nastic movement, in botany, the movement of plant parts in response either to certain external stimuli or to internal growth stimuli. Nastic movements, which are generally slow, can be observed by tim...

ayahuasca

(Encyclopedia)ayahuasca or yagé, drink made by boiling various South American plants, used for centuries by shamans of traditional societies in the Amazon region in religious and healing ceremonies. It is usually ...

licorice

(Encyclopedia)licorice lĭkˈərĭs, –rĭsh [key], name for a European plant (Glycyrrhiza glabra) of the family Leguminosae (pulse family) and for the sweet substance obtained from the root. Since early times the...

kohlrabi

(Encyclopedia)kohlrabi kōlˈräˈbē [key] [Ger. partly from Ital.,=turnip cabbage], plant (Brassica caulorapa, sometimes classified as var. caulorapa of the cabbage species) of the family Cruciferae (or Brassicac...

tannin

(Encyclopedia)tannin, tannic acid, or gallotannic acid, astringent vegetable product found in a wide variety of plants. Sources include the bark of oak, hemlock, chestnut, and mangrove; the leaves of certain sumac...

tragacanth

(Encyclopedia)tragacanth trăgˈəkănth [key] or gum tragacanth, gummy exudation from the leguminous shrub Astragalus gummifer and related pulse family plants of SE Europe and W Asia. It is obtained through incisi...