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Definition: Helenium

Part of Speech Definition
Noun 1. Genus of American herbs with flowers having yellow rays: sneezeweeds.[Wordnet].

Source: WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.

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Date "Helenium" was first used in popular English literature: sometime before 1828. (references)

Common Expressions: Helenium

Expressions Definition
Genus Helenium Genus of American herbs with flowers having yellow rays: sneezeweeds. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved.
Helenium autumnale North American perennial with bright yellow late summer flowers. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved.
Helenium hoopesii Stout perennial herb of western United States having flower heads with drooping orange-yellow rays; causes spewing sickness in sheep. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved.
Helenium puberulum A sneezeweed of southwestern United States especially southern California. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved.
Inula helenium Tall coarse Eurasian herb having daisylike yellow flowers with narrow petals whose rhizomatous roots are used medicinally. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved.

Source: compiled by the editor from various references; see credits.

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Specialty Expressions: Helenium

Expressions Domain Definition
Helenium autumnale Aerospace Sneezeweed is a native herb found in parts of central and western Canada. This plant causes illness and occasional death in cattle and horses. It has been proved to be experimentally toxic to dogs but it is very unlikely that dogs would voluntarily ingest it. The plant is well-named because it is highly irritating to the nose, eyes, and stomach (Kingsbury 1964, Cheeke and Schull 1985, Fuller and McClintock 1986, Herz 1988). Helenalin, a sesquiterpene lactone, is the major toxin found in sneezeweed. The LD-50 for helenalin is between 85 and 150 mg/kg, given orally to sheep. This compound contains a seven-membered ring, a lactone structure, and an exocylic methylene group (Cheeke and Schull 1985, Herz 1988). Sneezeweed causes poisoning and death in cattle. Symptoms include frothing at the mouth, incoordination, and convulsions. The plant is highly irritating to the nose, eyes, and stomach. Cows that ingest this plant produce bitter-tasting milk (Kingsbury 1964, Fuller and McClintock 1986). General symptoms of poisoning: 1- Cattle: a- breathing, labored; b- convulsions; c- death; d- incoordination; and e- mouth, frothing of; and 2- Horses: a- convulsions; b- incoordination; and c- weakness. (references)
Helenium flexuosum Aerospace Naked-flowered sneezeweed is a native herb found in Ontario and Quebec. This plant has caused poisoning in horses and sheep and, experimentally, in calves. It contains sesquiterpene lactones. Horses are more susceptible than sheep to poisoning by naked-flowered sneezeweed (Kingsbury 1964). General symptoms of poisoning: 1- Cattle, Horses and Sheep: a- convulsions; b- dyspnea; and c- weakness. (references)

Source: compiled by the editor from various references; see credits.

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Extended Definition: Helenium

Helenium

Helenium
Helenium autumnale
Helenium autumnale
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Tribe: Helenieae
Genus: Helenium
L.
Species

See text.

Helenium is a genus of about 40 herbaceous flowering plants in the daisy family Asteraceae, native to North America and Central America. They bear yellow or orange daisy-like flowers. A number of these species (particularly Helenium autumnale) are commonly known as sneezeweed because of the common allergenic reaction experienced by people in their vicinity.

Helenium species are used as food plants by the larvae of some Lepidoptera species including Phymatopus behrensii.

Species

Helenium species include:


 The subject of this article has been identified by the Missing Encyclopedic Articles project as being a high priority for expansion.

References

  • Everitt, J.H.; Lonard, R.L., Little, C.R. (2007). Weeds in South Texas and Northern Mexico. Lubbock: Texas Tech University Press.  ISBN 0-89672-614-2

Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "Helenium". Image Credit.
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Topics by Level of Interest: Helenium

Topics sorted by level of Interest Level (1=low, 600=high)     Topics sorted Alphabetically Level (1=low, 600=high)
Helenium autumnale 7     Helenium 6
Helenium 6     Helenium autumnale 7
Helenium bigelovii 4     Helenium bigelovii 4
Helenium virus S 3     Helenium virus S 3

Source: the editor, created by/for EVE to gauge likely levels of human interest in linguistically triggered topics (compiled across various sources, such as Wikipedia and specialty expression glosses).

Synonym: Helenium
Position Synonym (sorted by strength)

Expression

 genus Helenium.
Source: Eve, based on meta analysis. Top