| 单词 | common ragweed |
| 释义 | > as lemmascommon ragweed b. Chiefly North American. Any of various coarse, greyish-green plants constituting the genus Ambrosia (family Asteraceae ( Compositae)), typically having lobed or dissected leaves and heads of insignificant greenish flowers; esp. (more fully great ragweed) A. trifida, a tall-growing plant with palmately three-cleft leaves, and (more fully common ragweed) A. artemisiifolia, a common weed with bipinnatifid leaves (also called Roman wormwood).Ragweeds are major causes of hay fever in the United States and Australia. ΘΚΠ the world > plants > particular plants > plants and herbs > according to family > Umbelliferae (umbellifers) > [noun] > ragweed or ambrosia oak of Cappadocia1597 stickweed1705 ragweed1790 hogweed1811 1790 S. Deane New-Eng. Farmer 176/1 The milk of cows in summer is sometimes made very bitter by their feeding on rag-weed. 1840 C. Dewey Rep. Herbaceous Plants & Quadrupeds Mass. 142 Ambrosia elatior. Rag Weed. Wild Wormweed... The bruised leaves were formerly in popular use as an application to wounds and bruises. 1848 A. Gray Man. Bot. Northern U.S. 221 Ambrosia, Tourn. Rag-weed... A. trifida, L. (Great Rag-weed.) 1884 Amer. Naturalist 18 297 Even the common ragweed (Ambrosia artemisiæfolia) was eaten clean by the worms. 1910 C. M. Weed Farm Friends & Farm Foes 6 Others have nutlike fruits that are able to float upon running water. The tall ragweeds and the common ragweeds are examples of these. 1964 E. Salisbury Weeds & Aliens (ed. 2) v. 131 Great Ragweed..is a troublesome weed both in America and Canada. 1968 R. T. Peterson & M. McKenny Field Guide Wildflowers Northeastern & North-central N. Amer. 374 Common Ragweed. Ambrosia artemisiifolia... Note the dissected, artemisia-like leaves and interrupted racemes of tiny nodding green flower heads. 2001 Weekly Times (Australia) (Nexis) 31 Jan. 61 Ragweed..was first recorded as naturalised in Australia in 1922. < as lemmas |
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