''Helenium autumnale'' is a North American species of flowering plants in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. Common names include common sneezeweed and large-flowered sneezeweed.

Description

Common sneezeweed is a perennial herb up to tall. In late summer and fall, one plant can produce as many as 100 yellow

flower heads A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...

in a branching array. Each head has yellow 11–21

ray florets The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

surrounding sometimes as many as 800 yellow

disc floret The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

s. Leaves are dark green, alternate, and lance-shaped. The Latin specific epithet ''autumnale'' is in reference to the plant's autumn flowering.

Distribution and habitat

This plant is widespread across much of the United States and Canada, from

Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''NWT''; french: Territoires du Nord-Ouest, formerly ''North-Western Territory'' and ''North-West Territories'' and namely shortened as ''Northwest Territory'') is a federal territory of Canada. ...

as far south as far northern

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

Louisiana Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is borde ...

, and

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

. It has not been found in southern or central

, or the 4

Atlantic Provinces Atlantic Canada, also called the Atlantic provinces (french: provinces de l'Atlantique), is the region of Eastern Canada comprising the provinces located on the Atlantic coast, excluding Quebec. The four provinces are New Brunswick, Newfoundlan ...

of Canada. It grows in moist, open areas along streams and ponds as well as wet meadows.

Ecology

The flowers attract various pollinators, including bees, butterflies, and wasps. Because the plant is pollinated by insects, not wind pollinated, it does not cause seasonal allergies or sneezing, despite its common name.

Cultivation

Common sneezeweed is cultivated as a garden perennial. There are multiple named varieties varying in color and height. 'Pumilum Magnificum' is a yellow variety about two feet tall. 'Bruno', a reddish-brown cultivar, 'Kupfersprudel', which is yellow/orange, and 'Butterpat', which is golden, all grow tall. 'Chippersfield Orange' is up to tall and is orange streaked with gold.

Uses

The plant owes its name to the use of its dried leaves in snuff, the inhaling of which causes sneezing—supposedly casting out evil spirits.

References

External links

Jepson Manual TreatmentKemper Center for Home Gardening
*
photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 2002
{{Taxonbar, from=Q1520938 autumnale Flora of North America Plants described in 1753 Taxa named by Carl Linnaeus