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www.eol.org/pages/468106

Helianthus annuus (Common Sunflower) is a species of annual herb in the family Asteraceae. It has a self-supporting growth form. It is associated with freshwater habitat. Common Sunflower is native to the contiguous United States and North America. It has simple, broad leaves and yellow flowers. Flowers are visited by Brown-belted Bumblebee.

www.invasive.org/browse/subinfo.cfm?sub=5688

Appearance Helianthus annuus is a coarse, hairy, leafy, fast growing annual that grows from 5-10 ft (1.5-3 m) tall on stiff upright stalks. It is native to dry plains, prairies, meadows and foothills in the western U. S., Canada and northern Mexico. Foliage

www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a583

Common Name: common sunflower . Type: Annual Family: Asteraceae Native Range: United States and Central America Zone: 2 to 11 Height: 3.00 to 10.00 feet Spread: 1.50 to 3.00 feet Bloom Time: July to August Bloom Description: Yellow, red, mahogany, bicolor rays with brown to purple center disk ...

uswildflowers.com/detail.php?SName=Helianthus annuus

Helianthus annuus - Common Sunflower, Kansas Sunflower, Mirasol. Officially classified as a Secondary Noxious Weed in Iowa, Helianthus annuus can be quite weedy in other parts of its range as well, but has an attractive flower. It is found in dry open areas and disturbed sites in every state, is native from Minnesota to Texas and westward, and is introduced to the rest of the United States ...

science.halleyhosting.com/nature/gorge/sun/daisy/helianth/helianthusan.htm

Common sunflower is a common annual of dry western habitats. It stands from 40 to 200 cm tall, and has a rough, hairy texture to the stems and leaves. The stem often has side branches which end in flower heads. It has broad,triangular leaf blades with slightly toothed margins. The leaf is a dull dark green.

2bnthewild.com/plants/H285.htm

Common Sunflower (Helianthus annuus) Plant Type: This is a herbaceous plant, it is a annual which can reach a height of 3 Meters (10 feet ) . The stalk is hairy and sometimes branched. Leaves: The leaves are alternate.Opposite lower on the stalk. Each cordate leaf is irregularly toothed Flowers: The flowers have numerous parts.They are yellow. Blooms first appear in early summer and continue ...

pfaf.org/user/plant.aspx?LatinName=Helianthus+annuus

Helianthus annuus is a ANNUAL growing to 3 m (9ft) by 0.3 m (1ft in) at a fast rate. It is hardy to zone (UK) 7 and is not frost tender. It is in flower from July to September, and the seeds ripen from September to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, flies. The plant is not self-fertile.

www.gardeningknowhow.com/ornamental/flowers/sunflower/helianthus-perennial...

Ashy sunflower (Helianthus mollis): Ashy sunflower grows tall and vigorously, producing bright yellow, 3-inch (8 cm.) flowers.It can be invasive but looks great as part of a wildflower meadow.; Western sunflower(H. occidentals): This species, known as western sunflower, is shorter than many others and may be more suitable for a home garden.It is also less invasive and easier to contain.

plantvillage.psu.edu/topics/sunflower/infos

Sunflower, Helianthus annuus, is an herbaceous annual plant in the family Asteraceae, grown for its seeds.The plant has a thick, hairy, erect stem which gives rise to a large flower head. The plant has large, broad lower leaves which are oval and arranged alternately on the stem and smaller, narrower upper leaves which are attached individually to the stem.

www.almanac.com/plant/sunflowers

Sunflowers (Helianthus annuus) is an annual plant with a large daisy-like flower face.Its scientific name comes from the Greek words helios (“sun”) and anthos (“flower”).The flowers come in many colors (yellow, red, orange, maroon, brown) but they are commonly bright yellow with brown centers that ripen into heavy heads filled with seeds.