Geum macrophyllum

(Bur Avens, Large-leaf Avens)

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Geum macrophyllum, Indiana Creek, Summit Co. 6791

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Geum macrophyllum, Peak 7, Breckenridge, Summit Co. 8291

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Geum macrophyllum, Peak 7, Breckenridge, Summit Co. 8213

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Geum macrophyllum, Indiana Creek, Summit Co. 6747/6751

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Geum macrophyllum, Peaks Trail, Breckenridge, Summit Co. 7822

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Geum macrophyllum, Peak 7, Breckenridge, Summit Co. 8221

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Leaflets, Geum macrophyllum, Peaks Trail, Breckenridge, Summit Co. 7831

Scientific Name Geum macrophyllum USDA PLANTS Symbol GEMA4
Common Name Bur Avens, Large-leaf Avens ITIS Taxonomic Serial No. 24654
Family Rosaceae (Rose) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (5500 to 10000 ft ft.); moist areas in meadows, forests, streamsides.
Plant: Tall, erect perennial 12 to 48 inches tall; hairy stems, usually unbranched.
Leaves: Petiolate basal and stem leaves, margins irregularly cleft to toothed; basal leaves 3 to 12 inches long, pinnately-divided into 5 to 9 leaflets, the terminal one divided into 3 parts; stem leaves smaller, mostly divided into 3 leaflets, each 3/4 to 4-3/4 inches long, oblanceolate with leaf-like stipules, 1/4 to 3/4-inch long.
Inflorescence: Cyme of 2 to 15 flowers with 5 roundish, bright yellow petals; numerous (20 +/-) stamens; sepals erect-spreading initially, becoming reflexed.
Bloom Period: June to September.
Fruit: Bur-like seedhead with many styles bent at tips.
Reference: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel, "The Alpine Flora of the Rocky Mountains" by Richard W. Scott, 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