Helianthus

sunflowersunflowersHelianthus annuusSun flowersunflower seedsWild sunflowercommon sunflowerrelated plantsSolsequiumsun-flower
"Sunflower" and "sunflowers" redirect here.wikipedia
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Pseudanthium

flower headsflower headcapitula
They bear one or more wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon (also known as a brown/red) disc florets inside.
The real flowers (the florets) are generally small and often greatly reduced, but the pseudanthium itself can sometimes be quite large (as in the heads of some varieties of sunflower).

Sunflower seed

sunflower seedssunflowerLargest sunflower seed producer
The seeds of ''H.
The sunflower seed is the fruit of the sunflower (Helianthus annuus).

List of Lepidoptera that feed on Helianthus

List of Lepidoptera that feed on ''Helianthusmany lepidopterans
Helianthus species are used as food plants by the larvae of many lepidopterans.
Helianthus species are used as food plants by the larvae of a number of Lepidoptera species including:

Helianthus ambiguus

Helianthus × ambiguus
Helianthus ambiguus is a North American species of sunflower known by the common name ambiguous sunflower.

Helianthus agrestis

Helianthus agrestis is a species of sunflower known by the common name Southeastern sunflower.

Helianthus angustifolius

narrowleaf sunflower
Helianthus angustifolius is a species of sunflower known by the common name narrowleaf sunflower or swamp sunflower.

Helianthus argophyllus

H. argophyllus
Helianthus argophyllus is a North American species of sunflower known by the common name silverleaf sunflower.

Helianthus arizonensis

Helianthus arizonensis is a North American species of sunflower known by the common name Arizona sunflower.

Helianthus atrorubens

Helianthus atrorubens is a North American species of sunflower known by the common name Purpledisc sunflower.

Asteraceae

daisy familysunflower familydisc floret
The common names "sunflower" and "common sunflower" typically refer to the popular annual species Helianthus annuus, whose round flower heads in combination with the ligules look like the sun.
In some species, however, the pappus falls off (for example in Helianthus).

Helianthus bolanderi

Helianthus bolanderi is a species of sunflower known by the common names Bolander's sunflower and serpentine sunflower.

Helianthus californicus

California sunflower
Helianthus californicus is a North American species of sunflower known by the common name California sunflower.

Helianthus ciliaris

Texas blueweed
Helianthus ciliaris is a species of sunflower known by the common names Texas blueweed and yerba parda.

North America

NorthNorth AmericanNA
Except for three species in South America, all Helianthus species are native to North America and Central America.
Notable plants that were domesticated in North America include tobacco, maize, squash, tomato, sunflower, blueberry, avocado, cotton, chile pepper

Helianthus carnosus

Helianthus carnosus is a rare North American species of sunflower known by the common name lakeside sunflower.

Spiral

spiralsspherical spiralwhorl
Further, the florets of a sunflower are arranged in a natural spiral.
A model for the pattern of florets in the head of a sunflower was proposed by H. Vogel.

Helianthus cusickii

Cusick's sunflower
Helianthus cusickii is a species of sunflower known by the common names Cusick's sunflower and turniproot sunflower.

Helianthus debilis

H. debilis
Helianthus debilis is a species of sunflower known by the common names cucumberleaf sunflower, beach sunflower, weak sunflower, and East Coast dune sunflower.

Ohio

OHState of OhioOhio, USA
The Adena were able to establish "semi-permanent" villages because they domesticated plants, including, sunflowers, and "grew squash and possibly corn"; with hunting and gathering, this cultivation supported more settled, complex villages.

Helianthus cinereus

Helianthus cinereu is a species of sunflower native and with a sympatric distribution to the northern United States, especially Missouri, Kentucky, Indiana, and Ohio.

Heliotropism

heliotropicheliotropelight
This tracking of the sun in young sunflower heads is called heliotropism.
In case of sunflower, a common misconception is that sunflower heads track the Sun across the sky throughout the whole life cycle.

Helianthus dissectifolius

Helianthus dissectifolius is a rare species of sunflower, endemic to Mexico.

Helianthus exilis

Helianthus exilis is a species of sunflower known by the common name serpentine sunflower.

Helianthus floridanus

Helianthus floridanus is a species of sunflower known by the common name Florida sunflower.

Helianthus glaucophyllus

Helianthus glaucophyllus is a species of sunflower known by the common name Whiteleaf sunflower.