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FNA | Family List | FNA Vol. 5 | Polygonaceae | Eriogonum

107g. Eriogonum umbellatum Torrey var. sandbergii Reveal, Phytologia. 86: 154. 2004.

Sandberg's sulphur flower

Subshrubs, sprawling, 1-4 × 2-6 dm. Aerial flowering stems erect, 1-2.5(-3) dm, thinly tomentose to floccose, without one or more leaflike bracts ca. midlength. Leaves in loose rosettes; blade elliptic to ovate, 1-2.5(-3) × 0.5-1.5(-2) cm, densely lanate abaxially, gla-brous or nearly so and bright green adaxially, margins plane. Inflorescences umbellate; branches 0.3-2.5 cm, thinly tomentose to floccose, without a whorl of bracts ca. midlength; involucral tubes 2-3 mm, lobes 1.5-4 mm. Flowers 4-7 mm; perianth bright yellow.

Flowering May-Aug. Sandy to gravelly slopes and ravines, sagebrush communities, montane conifer woodlands; 300-1200 m; Wash.

Variety sandbergii is restricted to a series of scattered populations in the foothills and low mountains of the north Cascade Ranges of north-central Oregon (Hood River and Wasco counties) and central Washington (Chelan, Kittitas, Okanogan, and Yakima counties). It appears to be most closely related to the more southern, matted var. modocense.


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