1. 含有苦素的植物(如豚草等)：bittersweet || 又苦又甜的, 苦乐参半的 | bitterweed || 含有苦素的植物(如豚草等) | Bittner milk factor || 毕特纳乳因子
1. Genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed.
旧大陆一个草本属，生长茂盛，黄花，常含苦素；美洲的几种含有苦素的植物的任一种。
noun
1. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
2. widespread European weed with spiny tongue-shaped leaves and yellow flowers
naturalized in United States
Synonym: oxtongue bristly oxtongue bugloss Picris echioides