Helianthus annuus

(Common Sunflower)

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Helianthus annuus, SE of Mesa, Mesa Co. 2963

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Helianthus annuus, SE of Mesa, Mesa Co. 2971

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Helianthus annuus, SE of Mesa, Mesa Co. 2980

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Helianthus annuus, SE of Mesa, Mesa Co. 2966

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Helianthus annuus, SE of Mesa, Mesa Co. 2973

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Leaves, Helianthus annuus, SE of Mesa, Mesa Co. 2975

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Leaves, Helianthus annuus, SE of Mesa, Mesa Co. 2969

Scientific Name Helianthus annuus USDA PLANTS Symbol HEAN3
Common Name Sunflower, Common Sunflower ITIS Taxonomic Serial No. 36616
Family Asteraceae (Sunflower) SEINet
Reference
Click Here
Description Habitat: Plains to montane (3300 to 9000 ft.); dry soils, disturbed areas, fence rows. Widely distributed.
Plant: Erect annual, widely branching 1 to 8 feet tall, rough, hairy stems.
Leaves: Rough, alternate, ovate to ovate-oblong with cordate bases; blades 4 to 16 inches long and nearly as wide on long petioles.
Inflorescence: Bright yellow composite flower heads 3 to 5 inches across with 17 to 30 rays surrounding normally dark brown central disk florets; wide phyllaries ovate to lance-ovate, with ciliate margins, and abruptly narrowed, pointed tips.
Bloom Period: June to October.
References: "Flora of Colorado" by Jennifer Ackerfield, "Wildflowers of the Rocky Mountains" by Carl Schreier and SEINet.
BONAP Distribution Map


Map Color Key
Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County