Eriogonum umbellatum var. umbellatum

(Sulphur-flower Buckwheat)

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Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 3702

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Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 3718

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Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 3733

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Eriogonum umbellatum var. umbellatum, FR265, Gunnison National Forest, Gunnison Co. 2665

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Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 6969

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Eriogonum umbellatum var. umbellatum, North Swan River Valley, Summit Co. 5120

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Upper Leaf Surface, Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 3740

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Lower Leaf Surface, Eriogonum umbellatum var. umbellatum, Swan Mountain, Summit Co. 3742

Scientific Name Eriogonum umbellatum var. umbellatum USDA PLANTS Symbol ERUMU2
Common Name Sulfur-flower Buckwheat ITIS Taxonomic Serial No. 195595
Family Polygonaceae (Buckwheat) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (5500 to 10000 ft); dry slopes, sagebush meadows, forests.
Plant: Mat-forming perennial with erect stems up to to 10 inches tall; stems hairy and leafless.
Leaves: Basal elliptic to ovate leaves; lower surface grayish, densely covered with fine hairs; upper surfaces green, smooth or slightly hairy; 3/8 to 1 inch long and up to 5/8-inch wide.
Inflorescence: Clusters of tiny, sometimes red-tinted, buds becoming bright yellow flowers, each less than 1/4-inch across, forming large umbels with a single whorl of green, leafy bracts just below.
Bloom Period: June to October.
References: "Flora of Colorado" by Jennifer Ackerfield, SW Colorado Wildflowers and Flora of North America.
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