|Scientific Name||Rudbeckia hirta||USDA PLANTS Symbol||RUHI2|
|Common Name||Black-eyed Susan||ITIS Taxonomic Serial No.||36765|
|Description||Life zones and habitat: Foothills to montane (5200 to 10000 ft.); various, usually in sandy soils of fields, pastures, open areas.
Plant: Erect annual or short-lived perennial, rigid, grooved stems 12 to 40 inches tall covered with long, rough hairs.
Leaves: Petiolate basal leaves 3 to 12 inches long; alternate, petiolate or sessile stem leaves 1-1/4 to 8 inches long; blades lanceolate to elliptic, not lobed, covered with coarse hairs.
Inflorescence: Solitary or loose arrays of 2 to 5 large composite flowers on long peduncles, up head to 3 inches across with 8 to 16 drooping yellow rays with lengthwise grooves; central disk often-flattened and dome-shaped, yellowish green to purplish brown.
Bloom Period: June to September.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and American Southwest.
|BONAP Distribution Map
Map Color Key
© Tom Lebsack 2023
Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County