A European plant of the parsley family with yellowish-green flowers, formerly a widespread weed of cornfields.
- Genus Bupleurum, family Umbelliferae: two species, including B. rotundifolium, which is extinct in the wild in Britain
More example sentences
- Species lost to the UK in recent years include corncockle, thorow-wax and small bur-parsley.
- The conspicuous herbaceous cover of the spruce forests includes the ornamentals monkshood (Aconitum leucostomum), colombine (Aquilegia karelinii), thorow-wax (Bupleurum longifolium) and dragonhead (Dracocephalum integrifolium).