- Helianthus
Taxobox
name = "Helianthus"
image_width = 250px
image_caption = Sunflower ("Helianthus annuus")
regnum =Plant ae
divisio = Magnoliophyta
classis =Magnoliopsida
ordo =Asterales
familia =Asteraceae
subfamilia =Helianthoideae
tribus =Heliantheae
genus = "Helianthus"
genus_authority = L.
subdivision_ranks = Species
subdivision = See text.The "Helianthus" L.
genus comprises 67 species and several subspecies in theAsteraceae family, all of which are native toNorth America , with some species (particularly "Helianthus annuus " (sunflower) and "Helianthus tuberosus " (Jerusalem artichoke) cultivated inEurope and other parts of the world as food crops and ornamental plants.These are usually tall, annual or
perennial plant s, growing to a height of 50-390 cm. The rough and hairy stem is branched in the upper part. The petiolate leaves are dentate and often sticky. The lower leaves are opposite,ovate or often heart-shaped. The upper leaves are alternate and narrower.They bear several to many wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and maroon disc florets inside. These flower heads follow the direction of the
sun , going from east to west during the day."Helianthus" species are used as food plants by the
larva e of someLepidoptera species ("see"list of Lepidoptera that feed on Helianthus ).Species
* "Helianthis agrestis" : Southeastern Sunflower
* "Helianthus angustifolius " : Swamp Sunflower
* "Helianthus annuus " : Common Sunflower, Mirasol (Spanish)
* "Helianthus anomalus" : Western Sunflower
* "Helianthus argophyllus " : Silverleaf Sunflower
* "Helianthus arizonensis" : Arizona Sunflower
* "Helianthus atrorubens"
* "Helianthus bolanderi " : Serpentine Sunflower
* "Helianthus californicus " : California Sunflower
* "Helianthus carnosus" : Lakeside Sunflower
* "Helianthus ciliaris " : Texas Blueweed
* "Helianthus cinereus"
* "Helianthus couplandii" : Prairie Sunflower
* "Helianthus cusickii " : Cusick's Sunflower
* "Helianthus debilis " : Cucumberleaf Sunflower
** "Helianthus debilis" ssp. "cucumerifolius" : Cucumberleaf Sunflower
** "Helianthus debelis" ssp. "debilis" : Beach Sunflower, Dune Sunflower
** "Helianthus debilis" ssp. "silvestris" : Cucumberleaf Sunflower
** "Helianthus debilis" ssp. "tardiflorus" : Cucumberleaf Sunflower
** "Helianthus debilis" ssp. "vestitus" : Cucumberleaf Sunflower
* "Helianthus decapetalus " : Thinleaf Sunflower
* "Helianthus deserticola "
* "Helianthus divaricatus " : Woodland Sunflower
* "Helianthus eggertii" : Eggert's Sunflower
* "Helianthus floridanus" : Florida Sunflower
* "Helianthus giganteus "
* "Helianthus glaucophyllus" : Whiteleaf Sunflower
* "Helianthus gracilentus " : Slender Sunflower
* "Helianthus grosseserratus ": Sawtooth Sunflower
* "Helianthus heterophyllus " : Variableleaf Sunflower
* "Helianthus hirsutus "
* "Helianthus laciniatus " : Alkali Sunflower
* "Helianthus laetiflorus"
* "Helianthus laevigatus" : Smooth Sunflower
* "Helianthus longifolius" : Longleaf Sunflower
* "Helianthus maximiliani " : Maximillian Sunflower
* "Helianthus microcephalus " : Small Woodland Sunflower
* "Helianthus mollis "
* "Helianthus multiflorus"
* "Helianthus neglectus " : Neglected Sunflower
* "Helianthus niveus "
** "Helianthus niveus" ssp. "canescens" : Showy Sunflower
** "Helianthus niveus" ssp. "tephrodes" : Algodones Sunflower
* "Helianthus nuttallii "
** "Helianthus nuttallii" ssp. "nuttallii" : Nuttall's Sunflower
** "Helianthus nuttallii" ssp. "parishii" : Parish's Sunflower
** "Helianthus nuttallii" ssp. "Rydbergii" : Rydberg's Sunflower
* "Helianthus occidentalis " : Fewleaf Sunflower
** "Helianthus occidentalis" ssp. "occidentalis" : Fewleaf Sunflower
** "Helianthus occidentalis" ssp. "plantagineus" : Fewleaf Sunflower
* "Helianthus paradoxus " : Paradox Sunflower
* "Helianthus pauciflorus"
** "Helianthus pauciflorus" ssp. "pauciflorus" : Stiff Sunflower
** "Helianthus pauciflorus" ssp. "subrhomboideus" : Stiff Sunflower
* "Helianthus petiolaris"
** "Helianthus petiolaris" ssp. "fallax" : Prairie Sunflower
** "Helianthus petiolaris" ssp. petiolaris : Prairie Sunflower
* "Helianthus porteri" : Porter's Sunflower
* "Helianthus praecox"
** "Helianthus praecox ssp. hirtus" : Texas Sunflower
** "Helianthus praecox ssp. praecox" : Texas Sunflower
** "Helianthus praecox ssp. runyonii" : Runyon's Sunflower
* "Helianthus praetermissus" : New Mexico Sunflower
* "Helianthus pumilus" : Little Sunflower
* "Helianthus radula" : Rayless Sunflower
* "Helianthus resinosus" : Resindot Sunflower
* "Helianthus salicifolius " : Willowleaf Sunflower
* "Helianthus schweinitzii " : Schweinitz's Sunflower
*" Helianthus silphioides" : Rosinweed Sunflower
* "Helianthus simulans " : Muck Sunflower
* "Helianthus smithii" : Smith's Sunflower
* "Helianthus strumosus " : Paleleaf Woodland Sunflower
* "Helianthus tuberosus " : Jerusalem Artichoke, SunchokeExternal links
* [http://www.crescentbloom.com/Plants/Genus/H/e/Helianthus.htm See here for a more complete list of species]
Wikimedia Foundation. 2010.
