# Helenium microcephalum

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Species of flowering plant

For Helenium microcephalum Kuntze, see [Pentanema britannica](/source/Pentanema_britannica).

Helenium microcephalum Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade: Spermatophytes Clade: Angiosperms Clade: Eudicots Clade: Asterids Order: Asterales Family: Asteraceae Genus: Helenium Species: H. microcephalum Binomial name Helenium microcephalum DC. 1836 Synonyms[1][2] Helenium oöclinium A.Gray, syn of var. ooclinium Helenium ooclinium A.Gray, syn of var. ooclinium Heleniastrum ooclinium (A.Gray) Kuntze, syn of var. ooclinium Heleniastrum oöclinium(A.Gray) Kuntze, syn of var. ooclinium

***Helenium microcephalum*** is a North American [perennial plant](/source/Perennial_plant) in the family [Asteraceae](/source/Asteraceae), commonly known as **smallhead sneezeweed**.[3] It is found in the southwestern and south-central United States and northern Mexico.[4][5]

*Helenium microcephalum* is an annual herb up to 120 cm (3.9 ft) tall, with wings running down the sides of the stems. Leaves are narrow and [elliptical](/source/Leaf_shape). One plant can have 300 or more small spherical or egg-shaped [flower heads](/source/Flower_heads), generally no more than 12 mm (half an inch) in diameter. Each head can have 400 or more minuscule [disc flowers](/source/Disc_flowers) 1.2–2.4 mm (0.047–0.094 in) across, each yellow or yellow-green toward the bottom but brown or red toward the tip. There are also 7-13 red or yellow [ray flowers](/source/Ray_flowers).[3]

**Varieties[3][5]**

- *Helenium microcephalum* var. *microcephalum* - [Arizona](/source/Arizona), [New Mexico](/source/New_Mexico), [Oklahoma](/source/Oklahoma), [Colorado](/source/Colorado), [Texas](/source/Texas), [Coahuila](/source/Coahuila), [Nuevo León](/source/Nuevo_Le%C3%B3n), Tamaulipas

- *Helenium microcephalum* var. *ooclinium* (A. Gray) Bierner - [Texas](/source/Texas), [Coahuila](/source/Coahuila), [Chihuahua](/source/Chihuahua_(state)), [Nuevo León](/source/Nuevo_Le%C3%B3n), [Durango](/source/Durango), [San Luis Potosí](/source/San_Luis_Potos%C3%AD)

## References

1. **[^](#cite_ref-1)** [The Plant List, *Helenium microcephalum* DC.](http://www.theplantlist.org/tpl1.1/record/gcc-9165)

1. **[^](#cite_ref-2)** [International Code of Nomenclature for algae, fungi, and plants (Melbourne Code)](http://www.iapt-taxon.org/nomen/main.php?page=art60) see section 60.6

1. ^ [***a***](#cite_ref-iiiiiii_3-0) [***b***](#cite_ref-iiiiiii_3-1) [***c***](#cite_ref-iiiiiii_3-2) [Flora of North America, Helenium microcephalum de Candolle, 1836. Smallhead sneezeweed](http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066855)

1. **[^](#cite_ref-4)** [Biota of North America Program 2014 county distribution map](http://bonap.net/MapGallery/County/Helenium%20microcephalum.png)

1. ^ [***a***](#cite_ref-jjjjj_5-0) [***b***](#cite_ref-jjjjj_5-1) Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100

Taxon identifiers Helenium microcephalum Wikidata: Q15548108 Wikispecies: Helenium microcephalum CoL: 3K4LY EoL: 582628 FNA: 250066855 GBIF: 5401883 GRIN: 18214 iNaturalist: 163589 IPNI: 211859-1 IRMNG: 10976103 ITIS: 36018 NatureServe: 2.130833 NCBI: 2741159 Open Tree of Life: 3900012 Plant List: gcc-9165 PLANTS: HEMI POWO: urn:lsid:ipni.org:names:211859-1 Tropicos: 2702611 WFO: wfo-0000130760

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Adapted from the Wikipedia article [Helenium microcephalum](https://en.wikipedia.org/wiki/Helenium_microcephalum) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Helenium_microcephalum?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.