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Eriogonum umbellatum var. cognatum

Eriogonum umbellatum var. cognatum (Greene) Reveal  
Family: Polygonaceae
sulphur-flower buckwheat
[Eriogonum cognatum Greene, moreEriogonum umbellatum subsp. cognatum]
Eriogonum umbellatum var. cognatum image
  • FNA
  • Resources
James L. Reveal in Flora of North America (vol. 5)
Herbs, compact mats, 1-2(-2.5) × 1-3 dm. Aerial flowering stems erect, 1-1.5 dm, glabrous, without one or more leaflike bracts ca. midlength. Leaves in loose rosettes; blade oblong-obovate to elliptic or oval, (1-)1.5-2(-2.5) × 1-1.5(-2) cm, densely white-tomentose abaxially, thinly floccose or glabrous and dark green adaxially, margins plane. Inflorescences compound-umbellate, branched 2-4 times; branches glabrous, without a whorl of bracts ca. midlength; involucral tubes 3-5 mm, lobes 1-2.5 mm. Flowers 4-7 mm; perianth bright yellow. Herbs, compact mats, 1-2(-2.5) × 1-3 dm. Aerial flowering stems erect, 1-1.5 dm, glabrous, without one or more leaflike bracts ca. midlength. Leaves in loose rosettes; blade oblong-obovate to elliptic or oval, (1-)1.5-2(-2.5) × 1-1.5(-2) cm, densely white-tomentose abaxially, thinly floccose or glabrous and dark green adaxially, margins plane. Inflorescences compound-umbellate, branched 2-4 times; branches glabrous, without a whorl of bracts ca. midlength; involucral tubes 3-5 mm, lobes 1-2.5 mm. Flowers 4-7 mm; perianth bright yellow.

Flowering Jul-Sep. Sandy flats and slopes, sagebrush communities, oak and montane conifer woodlands; 1600-2200 m; Ariz.

Flowering Jul-Sep. Sandy flats and slopes, sagebrush communities, oak and montane conifer woodlands; 1600-2200 m; Ariz.

Variety cognatum is localized and rather infrequent in south-central Coconino County and also barely enters Gila and Yavapai counties. It is seen most frequently in the greater Flagstaff area.



Variety cognatum is localized and rather infrequent in south-central Coconino County and also barely enters Gila and Yavapai counties. It is seen most frequently in the greater Flagstaff area.

Eriogonum umbellatum var. cognatum
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Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Kirstin Phillips
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
Eriogonum umbellatum var. cognatum image
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