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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 .
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]
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Goldenrod, the glorious fall-blooming flower, is critical for monarch butterflies as they are passing through WNC on their way to Mexico.
Solidago altissima, the tall goldenrod [5] or late goldenrod, [6] is a North American species of goldenrod in the family Asteraceae which is widespread across much of Canada, the United States, and northern Mexico. It is common in much of its range and fairly tolerant of landscapes which have been disturbed by humans.
Solidago sempervirens, the seaside goldenrod [3] or salt-marsh goldenrod, [4] is a plant species in the genus Solidago of the family Asteraceae. It is native to eastern North America and parts of the Caribbean. It is an introduced species in the Great Lakes region. [5]