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Click to read about Eriogonum.
See more Eriogonum   and  more  and  Eriogonum cernuum.
Eriogonum arcuatum
Eriogonum arcuatum variety arcuatum. Synonyms: Eriogonum jamesii variety flavescens, Eriogonum jamesii variety higginsii, Eriogonum bakeri. (Curved Buckwheat)
Polygonaceae (Buckwheat Family)

Foothills, montane. Meadows, shrublands, woodlands.  Summer, fall.
Navajo Reservation south of Teec Nos Pos, Arizona, June 24, 2006.

Eriogonum arcuatum and Eriogonum jamesii can be difficult to tell apart, and, in fact, for five years after I took the photographs on this page, I had them labeled as E. jamesii, but I changed that name after being alerted to my mistake by James Reveal, Eriogonum expert.  Reveal indicates in his treatment of Eriogonum in the Flora of North America, "Eriogonum arcuatum has long been included under E. jamesii". In Reveal's key to the Eriogonum, he gives them each species status. 

However, Stanley Welsh, Utah flora expert and one time Professor to Reveal, disagrees with Reveal: "The concept of E. jamesii is restricted [in FNA] to those [plants] with white to cream colored flowers.  Use of flower color as the basis for segregation seems to this writer to be superfluous, and [therefore I maintain] the traditional application of the name E. jamesii".

Add some more spice: William Weber equates E. bakerii with E. jamesii.

The two plants, E. arcuatum and E. jamesii, are nearly identical in almost all of their characteristics and measurements; they are separated by their flower color: yellow for E. arcuatum and white to cream for E. jamesii and they are best separated, according to Reveal, by their flower color (yellow for E. arcuatum and white to cream for E. jamesii) and by their inflorescences (compound umbellate for E. jamesii and capitate of umbellate for E. arcuatum)In addition, although the upper side of the leaves of both species may be densely woolly-hairy, the upper side of E. jamesii leaves can be "thinly hairy or even glabrous".

Note that the E. arcuatum plant shown on this page is growing in a hot, dry environment and the E. jamesii on the linked page is growing in a warm, more moist environment.  Thus the considerable difference in their appearance.  In similar environments, the two plants are difficult to tell apart. See E. jamesii on this web site.

Edward Greene named this species in 1901 from a specimen collected "on hillsides about Pagosa Springs, Colorado" on July 17, 1899.  "Arcuatum" is Latin for "curved or arched" and perhaps refers to the curved peduncles.

Eriogonum arcuatum
Eriogonum arcuatum variety arcuatumSynonyms: Eriogonum jamesii variety flavescens, Eriogonum jamesii variety higginsii, Eriogonum bakeri. (Curved Buckwheat)
Polygonaceae (Buckwheat Family)

Foothills, montane. Meadows, shrublands, woodlands. Summer, fall.
Navajo Reservation south of Teec Nos Pos, Arizona, June 24, 2006.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Eriogonum arcuatum

Range map for Eriogonum arcuatum variety arcuatum