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thorn

(Encyclopedia) thorn, sharp-pointed projection on some plants, usually protective in function. Botanically, thorns are distinguished as modified stems (as in the honey locust and…

cactus

(Encyclopedia) cactus, any plant of the family Cactaceae, a large group of succulents found almost entirely in the New World. A cactus plant is conspicuous for its fleshy green stem,…

Saguaro National Park

(Encyclopedia) Saguaro National Park, 91,443 acres (37,021 hectares), SE Ariz. Contained within the desert park are many examples of the saguaro cactus ( Cereus giganteus ), a…

Britton, Nathaniel Lord

(Encyclopedia) Britton, Nathaniel Lord, 1859–1934, American botanist, grad. Columbia School of Mines, 1879. He taught geology and botany at Columbia, 1879–96. He was the New York…

climbing plant

(Encyclopedia) climbing plant, any plant that in growing to its full height requires some support. Climbing plants may clamber over a support (climbing rose), twine up a slender support…

transpiration

(Encyclopedia) transpiration, in botany, the loss of water by evaporation in terrestrial plants. Some evaporation occurs directly through the exposed walls of surface cells, but the…

Veracruz

(Encyclopedia) Veracruz vāräkro͞os´ [key] [Span.,=true cross], officially Veracruz Llave vāräkro͞os´ yä´bā [key], state (1990 pop. 6,228,239), 27,759 sq mi (71,896 sq km), E…

stem

(Encyclopedia) stem, supporting structure of a plant, serving also to conduct and to store food materials. The stems of herbaceous and of woody plants differ: those of herbaceous plants…

Weston, Edward

(Encyclopedia) Weston, Edward, 1886–1958, American photographer, b. Highland Park, Ill. Weston began to make photographs in Chicago parks in 1902, and his works were first exhibited in…

spurge

(Encyclopedia) spurge spûrj [key], common name for members of the Euphorbiaceae, a family of herbs, shrubs, and trees of greatly varied structure and almost cosmopolitan distribution,…