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It is present in Europe and Asia as an introduced species, and it is known as a common weed in many regions. [3] Its common names include great ragweed, Texan great ragweed, giant ragweed, tall ragweed, blood ragweed, perennial ragweed, horseweed, [4] buffaloweed, and kinghead. [5]
Ragweed pollen can remain airborne for days and travel great distances, and can even be carried 300–400 miles (500–600 km) out to sea. [12] Ragweeds native to the Americas have been introduced to Europe starting in the nineteenth century and especially during World War I , and have spread rapidly since the 1950s. [ 15 ]
The species name, artemisiifolia, is given because the leaves were thought to bear a resemblance to the leaves of Artemisia, the true wormwoods. It has also been called the common names: American wormwood, bitterweed, blackweed, carrot weed, hay fever weed, Roman wormwood, short ragweed, stammerwort, stickweed, tassel weed.
The species is monoecious, and the inflorescence is composed of staminate (male) flower heads with the pistillate heads located below and in the axils of leaves. [7] This bloom period is from June through November. The pistillate heads yield fruits which are achenes located within oval-shaped greenish-brown burs about half a centimeter long ...
Ambrosia tomentosa – skeletonleaf bur ragweed, silverleaf povertyweed, skeleton-leaf bursage; Ambrosia trifida – giant ragweed, great ragweed, Texan great ragweed, giant ragweed, tall ragweed, blood ragweed, perennial ragweed, horseweed, buffaloweed, kinghead; Amphipappus fremontii – chaffbush, eytelia; Arnica gracilis – Smallhead arnica
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N Ambrosia artemisiifolia – common ragweed, annual ragweed, annual bur-sage; N Ambrosia psilostachya – perennial ragweed, western ragweed, naked-spike ambrosia, Cuman ragweed; N Ambrosia trifida – giant ragweed, great ragweed, buffalo-weed, skeleton-leaf bur-sage; Amelanchier. N Amelanchier alnifolia – Saskatoonberry, northwestern ...
Ambrosia ambrosioides, also known as canyon ragweed or chicura, is a ragweed found in the deserts of northern Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sonora), Arizona, and California (Ventura + San Diego Counties).