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en.wikipedia.org/wiki/Helianthus_annuus

Helianthus annuus, the common sunflower, is a large annual forb of the genus Helianthus grown as a crop for its edible oil and edible fruits. This sunflower species is also used as wild bird food, as livestock forage (as a meal or a silage plant), in some industrial applications, and as an ornamental in domestic gardens. The plant was first domesticated in the Americas.

www.minnesotawildflowers.info/flower/common-sunflower

Common Sunflower is present in all 50 states, though only native to the lower 48, and is the plant from which many cultivated sunflowers were derived. I have mostly seen it in full sun along roadsides and construction sites, where the soil is heavily disturbed and usually dry.

www.inaturalist.org/taxa/57983-Helianthus-annuus

Helianthus annuus, the common sunflower, is a large annual forb of the genus Helianthus grown as a crop for its edible oil and edible fruits (sunflower seeds). This sunflower species is also used as bird food, as livestock forage (as a meal or a silage plant), and in some industrial applications. The plant was first domesticated in the Americas.

www.smmtc.org/plantofthemonth/Common_Sunflower.php

Common Sunflower blooms from February to October, nearly all year. It is similar in appearance to Slender Sunflower, but larger and more stout. The large radiant flowers punctuate the tops of long erect stems, with yellow ray flowers and brownish purple disk flowers, overall varying from 2 to 6 inches in diameter.

www.invasiveplantatlas.org/subject.html?sub=5688

Synonym(s): annual sunflower, sunflower, wild sunflower 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.

fieldguide.mt.gov/detail_PDAST4N030.aspx

Common sunflower Taprooted annual. Stems erect, often branched, 25–100 cm. Herbage scabrous to sparsely hispid. Leaves alternate; blades weakly to strongly serrate, lanceolate to ovate, sometimes cordate, 5–20 cm long.

www.gardenia.net/plant/helianthus-annuus-evening-sun

Particularly eye-catching, Helianthus annuus 'Evening Sun' (Common Sunflower) is a fast-growing, well-branched annual with oblong to lanceolate leaves and flowers that are reminiscent of a brilliant sunset. From summer to fall, it produces a profusion of large blossoms, up to 8-10 in. across (20-25 cm), adorned with warm copper to mahogany petals and a dark chocolate central disc.

thenatureniche.com/2012/09/01/common-sunflower

Common sunflower is an aggressive, invasive plant. Along roadsides or fence rows it is a pretty wildflower. However, when sunflowers invade fields, pastures or agricultural crops they become noxious weeds. As an annual, the plants die each year. Particularly in our arid environment, the stems and seed heads will persist for several years as ...

plants.usda.gov/java/ClassificationServlet?source=display&classid=HELIA3

Species Helianthus annuus L. – common sunflower P: Species Helianthus anomalus S.F. Blake – western sunflower P: Species Helianthus argophyllus Torr. & A. Gray – silverleaf sunflower P: Species Helianthus arizonensis R.C. Jacks. – Arizona sunflower P: Species Helianthus atrorubens L. – purpledisk sunflower P

www.ftd.com/blog/share/types-of-sunflowers

The most common sunflower is that of the species Annuus and is known for its ordinary height and yellow color. However, despite popular belief, not all sunflowers grow to be the same size and color. Because of the several different species that occupy the Helianthus genus, we are going to break it down into three groups for you: