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Acalypha ostryifolia, sometimes spelled ostryaefolia, is a plant in the family Euphorbiaceae and is commonly known as hophornbeam copperleaf, hornbeam copperleaf, or pineland threeseed mercury, [3] is an annual herb of the copperleaf genus Acalypha. [4] It is a native of North and Central America and is generally considered a weed. [5]
Centaurea cyanus, commonly known as cornflower or bachelor's button, [note 1] is an annual flowering plant in the family Asteraceae native to Europe. In the past, it often grew as a weed in cornfields (in the broad sense of "corn", referring to grains, such as wheat, barley, rye, or oats), hence its
Veratrum californicum (California corn lily, white or California false hellebore) is an extremely poisonous plant [1] native to western North America, including the Sierra Nevada and Rocky Mountains, as far north as Washington and as far south as Durango; depending on latitude, it grows from near sea level to as high as 11,000 feet.
Veronica arvensis, common names: wall speedwell, [1]: 592 corn speedwell, common speedwell, rock speedwell, [2] field speedwell, [3] is an annual flowering plant in the plantain family Plantaginaceae. The species is native to Europe and a common weed in gardens, pastures, waste places, and cultivated land. [1]
Veratrum viride, known as Indian poke, corn-lily, Indian hellebore, false hellebore, green false hellebore, [2] or giant false-helleborine, [3] is a species of Veratrum native to eastern and western (but not central) North America. [4] [2] [5] It is extremely toxic, and is considered a pest plant by
Taxonomically, the term "weed" has no botanical significance, because a plant that is a weed in one context, is not a weed when growing in a situation where it is wanted. Some plants that are widely regarded as weeds are intentionally grown in gardens and other cultivated settings. For this reason, some plants are sometimes called beneficial weeds.
Centaurea (/ ˌ s ɛ n t ɔː ˈ r iː ə /) [1] is a genus of over 700 species of herbaceous thistle-like flowering plants in the family Asteraceae.Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich.
Anthemis arvensis, also known as corn chamomile, mayweed, scentless chamomile, [5] or field chamomile [6] [7] is a species of flowering plant in the genus Anthemis, in the aster family. It is used as an ornamental plant .