|Scientific Name||Helianthus annuus||USDA PLANTS Symbol||HEAN3|
|Common Name||Sunflower, Common Sunflower||ITIS Taxonomic Serial No.||36616|
|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
© Tom Lebsack 2023
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County