Helianthus petiolaris ssp. fallax

(Prairie Sunflower)

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Helianthus petiolaris ssp. fallax, Great Sand Dunes National Park 8611

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Helianthus petiolaris ssp. fallax, Great Sand Dunes National Park 8624

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Helianthus petiolaris ssp. fallax, Great Sand Dunes National Park 8632

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Leaves, Helianthus petiolaris ssp. fallax, Great Sand Dunes National Park 8618

Scientific Name Helianthus petiolaris ssp. fallax USDA PLANTS Symbol HEPE
Common Name Prairie Sunflower ITIS Taxonomic Serial No. 36671
Family Asteraceae (Sunflower) SEINet
Reference
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Description 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
Colorado Status:
Native

© Tom Lebsack 2022

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