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

129a. Eriogonum arcuatum Greene var. arcuatum

Baker's wild buckwheat

Eriogonum bakeri Greene; E. flavum Nuttall var. tectum (A. Nelson) S. Stokes; E. jamesii Bentham subsp. bakeri (Greene) S. Stokes; E. jamesii subsp. flavescens (S. Watson) S. Stokes; E. jamesii var. flavescens S. Watson; E. jamesii var. higginsii S. L. Welsh

Plants spreading, compact mats, (1-)2-3(-6) dm wide. Aerial flowering stems (0.3-)0.5-2 dm. Leaf blades oblanceolate to elliptic, (0.5-)1-3 × 0.5-1.5 cm. Inflorescences umbellate or compound-umbellate, branched 1-3 times, rarely capitate; bracts (0.3-)0.5-2 × (0.3-)0.4-1 cm. Involucres 3-7 × (3-)4-8 mm. Flowers (4-)5-8 mm.

Flowering Jun-Oct. Sandy, clayey, gravelly, or rocky flats, slopes and outcrops, ledges and cliffs, mixed grassland, saltbush, creosote bush, blackbrush, and sagebrush communities, pinyon, juniper, or conifer woodlands; 1000-3000 m; Ariz., Colo., N.Mex., Utah, Wyo.

Variety arcuatum is widely distributed and occasionally common from southeastern Wyoming south in central and western Colorado, eastern Utah, northern Arizona, and northwest New Mexico. Some specimens of var. arcuatum gathered in southeastern Wyoming can be difficult to distinguish from Eriogonum flavum. Plants with capitate inflorescences, sometimes recognized as var. higginsii, occur throughout the range of the variety. If such distinction is to be made, the earliest available epithet is tectum.


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