| 单词 | russian knapweed |
| 释义 | > as lemmasRussian knapweed Russian knapweed n. (a) a yellow-flowered knapweed, Centaurea ruthenica (rare); (b) a perennial Eurasian knapweed, Acroptilon repens (formerly included in the genus Centaurea), with pink-purple flowers and creeping roots, considered to be invasive weed in North America and certain other areas. ΚΠ 1907 M. C. Sedgwick & R. Cameron Garden Month by Month 296 (table) Russian Knapweed..Centaurea Ruthenica..Large thistle-like flowers. Dark green ornamental leaves deeply divided. 1914 Through Leaves (Great West. Sugar Company) Jan. 395 This seed can be identified by the presence of Russian knapweed seed... Much harm is being done by its being introduced in Turkestan alfalfa. 1989 I. Frazier Great Plains x. 188 Before white men, the Great Plains had no Russian knapweed, no goat grass, no cow cockle, no summer cypress. 2005 Rangeland Ecol. & Managem. 58 487/2 Crops such as alfalfa produce dense shade under irrigation and have been used to suppress Russian knapweed (Acroptilon repens L.). < as lemmas |
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