|Scientific Name||Helianthus petiolaris ssp. fallax||USDA PLANTS Symbol||HEPE|
|Common Name||Prairie Sunflower||ITIS Taxonomic Serial No.||36671|
Life zones and habitat: Plains to foothills (3300 to 6500 ft.); dry sandy soils in open areas.
Plant: Erect annual 1-1/2 to over 6 feet tall, often-branched stem with fine hairs.
Leaves: Mostly stem leaves, lanceolate to ovate, 1-1/2 to 6 inches long, petiolate; lower leaves are about twice as wide as long; may be dotted with glands, hairy underneath, small teeth along edges.
Inflorescence: Single composite flowers 2 to 3 inches across with 15 to 30 yellow rays and 50 to 100+ reddish disk florets in the center; involucre phyllaries are oblong-lanceolate to lanceolate and relatively narrow compared to ssp. petiolaris; peduncle with leafy bract subtending the head.
Bloom Period: June to October.
References: "Flora of Colorado" by Jennifer Ackerfield, Flora of North America and SEINet.
|BONAP Distribution Map
Map Color Key
© Tom Lebsack 2022
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County