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

120c. Eriogonum sphaerocephalum Douglas ex Bentham var. halimioides (Gandoger) S. Stokes, Eriogonum. 104. 1936.

Halimium wild buckwheat

Eriogonum halimioides Gandoger, Bull. Soc. Roy. Bot. Belgique 42: 197. 1906; E. fruticulosum S. Stokes

Leaf blades mostly narrowly oblanceolate to narrowly spatulate, mostly tomentose on both surfaces or floccose adaxially, margins usually plane. Inflorescences capitate or umbellate. Perianths pale yellow to cream or ochroleucous. 2n = 40.

Flowering May-Jul. Sandy to gravelly, occasionally volcanic flats and slopes, sagebrush communities, juniper and montane conifer woodlands; 300-2300 m; Calif., Idaho, Nev., Oreg., Wash.

Variety halimioides is common and widespread in three areas of concentration. The northernmost is east of the Cascade Range in central Washington (Douglas, Kittitas, Klickitat, and Yakima counties). The middle series of populations occurs from central Oregon (Gilliam, Jefferson, Union, Wallowa, and Wasco counties) east into Idaho (Blaine, Elmore, Gem, Gooding, and Washington counties). The southernmost series is in central-southern Oregon (Baker, Grant, Harney, Jackson, Klamath, Lake, Malheur, and Wheeler counties), northeastern California (Lassen, Modoc, Shasta, and Siskiyou counties), and northwestern Nevada (Humboldt and Washoe counties).

Variety halimioides is highly variable, and a clear distinction between it and some populations assigned here to E. douglasii var. douglasii is not always possible. Of particular concern are those plants of var. halimioides in northeastern Oregon and adjacent southeastern Washington with capitate rather than umbellate inflorescences. Much of what has passed for E. douglasii (especially its sublineare phase) in that area actually may be var. halimioides.


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