| 单词 | bitterweed |
| 释义 | bitterweed (once / 1969886 pages) 1n 2n WORD FAMILY bitterweed 1 n widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States 2Syn|Hyper Picris echioides, bristly oxtongue, bugloss, oxtongue weed any plant that crowds out cultivated plants n any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma Syn|Hypo|Hyper ambrosia, ragweed Ambrosia artemisiifolia, common ragweed annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally Ambrosia trifida, great ragweeda coarse annual with some leaves deeply and palmately three-cleft or five-cleft Ambrosia psilostachya, perennial ragweed, western ragweedcoarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico weed any plant that crowds out cultivated plants |
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