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Solidago canadensis, known as Canada goldenrod or Canadian goldenrod, is an herbaceous perennial plant of the family Asteraceae. [2] It is native to northeastern and north-central North America [ 3 ] and often forms colonies of upright growing plants, with many small yellow flowers in a branching inflorescence held above the foliage.
Goldenrod often is inaccurately said to cause hay fever in humans. [26] The pollen causing this allergic reaction is produced mainly by ragweed (Ambrosia sp.), blooming at the same time as the goldenrod and pollinated by wind. Goldenrod pollen is too heavy and sticky to be blown far from the flowers, and is pollinated mainly by insects. [26]
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 ]
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Goldenrod has heavier pollen that must be carried by a pollinator from plant to plant whereas ragweed has lighter weight pollen that is blown by the wind, causing those pesky fall allergies.
Goldenrod is a common name for many species of flowering plants in the sunflower family, Asteraceae, commonly in reference to the genus Solidago. Several genera, such as Euthamia , were formerly included in a broader concept of the genus Solidago .
Goldenrod, the glorious fall-blooming flower, is critical for monarch butterflies as they are passing through WNC on their way to Mexico.
Solidago rugosa, commonly called the wrinkleleaf goldenrod [2] or rough-stemmed goldenrod, [3] is a species of flowering plant in the family Asteraceae.It is native to North America, where it is widespread across eastern and central Canada (from Newfoundland to Ontario) and the eastern and central United States (Maine west as far as Wisconsin and Iowa, south to Florida and Texas). [4]