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

107m. Eriogonum umbellatum Torrey var. humistratum Reveal, Phytologia. 66: 260. 1989.

Scott Mountain sulphur flower

Herbs, prostrate mats, 0.7-2 × 1-3 dm. Aerial flowering stems erect or nearly so, 0.5-1.5 dm, floccose, without one or more leaflike bracts ca. midlength. Leaves in rather compact rosettes; blade broadly elliptic, 0.5-1(-1.5) × 0.5-1 cm, densely white-tomentose on both surfaces or slightly less so adaxially. Inflorescences umbellate; branches (2-)2.5-5 cm, floccose, without a whorl of bracts ca. midlength; involucral tubes 1.5-2 mm, lobes 1.5-3 mm. Flowers 3-6 mm; perianth bright yellow.

Flowering Jun-Sep. Gravelly serpentine slopes and ridges, montane conifer woodlands; 1700-2800 m; Calif.

Variety humistratum is restricted to exposed serpentine in four areas in Siskiyou and Trinity counties of northern California: White Mountain, Mt. Eddy-Scott Mountain, the Marble Mountains, and Mt. Shasta.


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