Woody achene with 4-7 spine-like projections, resembling a crown. They contain numerous seeds that are viable for up to 5 years. Monoecious, male flowers in 1-4 inch long terminal racemes occur and may have 2 short side spikes. Female flowers are in axillary clusters below the male.

Slender spike-like racemes, sometimes branched, from 1 to 6 inches long at the tip of the central stem and branches. Male (staminate) flowers are yellow to greenish, tiny, hanging down on short stalks, petal-less and bead-like.

2021年7月23日 · Growing Ambrosia Artemisiifolia; Oh, ragweed (Ambrosia artemisiifolia). This maligned plant while rare-ish in Haliburton and considered a “weed” in this part of Ontario is actually native to North America. It’s at least as valuable to a swath of wildlife as it is likely to cause a human to sneeze.

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Common ragweed (Ambrosia artemisiifolia) is a widespread and common agricultural, waste area, and garden weed in New York. It is a summer annual, can cause significant crop loss if left unmanaged for 2-3 weeks after planting, and is the main late-summer allergen in the US.

2024年1月31日 · Ambrosia Artemisiifolia, better known as Common Ragweed, is one of the most commonly seen members of the Daisy family in the USA. The widespread growing nature of Common Ragweed across North America has seen it classified by many farmers and gardeners as a weed that should be removed if possible.

Ambrosia artemisiifolia Aster family (Asteraceae) Description: This plant is a summer annual up to 3' tall that branches frequently. The hairy stems are green to light pinkish red. The leaves are up to 6" long and 4" across, and are opposite or alternate along the stems.

2017年10月29日 · This datasheet on Ambrosia artemisiifolia covers Identity, Overview, Distribution, Dispersal, Hosts/Species Affected, Diagnosis, Biology & Ecology, Environmental Requirements, Natural Enemies, Impacts, Uses, Prevention/Control, Further Information.

Ambrosia artemisiifolia × Ambrosia trifida → Ambrosia ×‌helenae Rouleau is an extremely rare ragweed hybrid known only from CT in New England. It ismost likely to be confused with A. trifida due to the palmately or subpalmately lobed leaf blades.

wfo-0000063493 Ambrosia artemisiifolia L. Sp. Pl. : 988 (1753) This name is reported by Asteraceae as an accepted name in the genus Ambrosia (family Asteraceae ).