Sulphur Flower (3)

Sulphur Flower
Eriogonum umbellatum var. aureum

Family: Buckwheat (Polygonaceae)
AKA: Yellow Buckwheat, Sulphur Flower Buckwheat
Photo taken on: July 26, 2015
Location: Almont, GV, CO
Life Zones: Foothills to subalpine
Habitat: Dry meadows and slopes

Grows to 1ft high in mats up to 2ft across with small, hairless, leathery basal leaves which turn red in the Fall. Flowers are tiny and grow in tight clusters. As they age they too turn orange or red. Common in Colorado.

Flora of North America reference.

Porter's Sulphur Flower
Eriogonum umbellatum var. porteri

Family: Buckwheat (Polygonaceae)
AKA:
Photo taken on: July 24, 2015
Location: Scarp Ridge, GV, CO
Life Zones: Subalpine and alpine
Habitat: Dry meadows and rocky slopes

Grows in a mat up to 20" across. Leaves are hairless and rounded. Flower stems are 2" high.

Flora of North America reference.

Alpine Sulphur Flower
Eriogonum flavum

Family:Buckwheat (Polygonaceae)
AKA: Alpine Yellow Buckwheat, Alpine Golden Buckwheat
Photo taken on: July 16, 2006
Location: Green Lake - Irwin, GV, CO
Life Zones: Alpine
Habitat: Rocky areas and slopes

Similar to Sulphur Flowers above but grows to only 3" high with a stout, hairy stem and woolly leaves. Photo credit.

Flora of North America reference.