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     See more Eriogonum and  more  and  Eriogonum cernuum.

Eriogonum corymbosum
Eriogonum corymbosum
Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat)
Polygonaceae (Buckwheat Family)

Semi-desert. Shrublands, woodlands, rocks. Summer, fall.
Above: Canyonlands National Park, Island in the Sky, September 27, 2005.
Left: Big Spring Trail, Canyonlands National Park, Utah, September 10, 2005.

Eriogonum corymbosum can be found flowering when it is just a few inches tall and wide to over four feet tall and wide. It looks like a soft, spongy fluff of green when leafed out, of white when in flower, and of brown when in seed. 

The plant enjoys rocky areas of the semi-desert and, as shown here, roots into the tiniest of rock crevices.  The plant pictured is growing about 20 feet down from the top of a two hundred foot steep rock face.  Water washes over the surface and issues from the cracks after a good rain, thus keeping the plant happy.

Eriogonum corymbosum's distinctive rounded mass of flowers makes it easy to spot in the rocks of Canyon Country.  Even in winter one can spot the plant fairly easily because of the numerous dried flower stems at the top of the plant.

A "corymb" is a flat-topped flower formation in which each flower's stem is attached to the main stem at a different point.  "Osum" is a Latin ending meaning "full of" and this plant certainly is "full of corymbs".

Eriogonum corymbosum
Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat)
Polygonaceae (Buckwheat Family)

Semi-desert. Shrublands, woodlands, rocks. Summer, fall.
Canyonlands National Park, Island in the Sky, September 27, 2005.
 

Eriogonum corymbosum was named by George Bentham in 1856 from a collection made by John Fremont near the Grand River (now the Colorado River) near Eagle, Colorado in 1845. In Utah Canyon Country, the plant is sometimes commonly called "Fremont's Buckwheat".

 
Eriogonum corymbosum
Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat)
Polygonaceae (Buckwheat Family)

Semi-desert. Shrublands, woodlands, rocks. Summer, fall.
Along the Colorado River near Moab, Utah, September 26, 2005.

At over four feet in diameter, this is not an unusual Eriogonum corymbosum.

Eriogonum corymbosum

Eriogonum corymbosum

Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat)
Polygonaceae (Buckwheat Family)

Semi-desert. Shrublands, woodlands, rocks. Summer, fall.
Grandview Point Trail, Canyonlands National Park, Utah, September 27, 2005. 

Brilliant white flowers give way to russets.

Eriogonum corymbosum variety velutinum

Eriogonum corymbosum variety velutinum

Eriogonum corymbosum variety velutinum (Fremont's Velvet Buckwheat)
Polygonaceae (Buckwheat Family)

Semi-desert. Shrublands, woodlands, rocks. Summer, fall.
Along the Colorado River near Moab, Utah, September 26, 2005.

Eriogonum corymbosum variety velutinum is the most widely distributed variety of E. corymbosum. It is separated from other varieties by its elliptic-oblong to oblong or ovate, rarely cordate leaves which are 1.5–3 cm long, 1.5–2.5 cm wide, and by its dense, short, matted, white hairiness.

"Velutinum" is Latin for "fleece".

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

Range map for Eriogonum corymbosum

Eriogonum corymbosum variety orbiculatum

Range map for E. corymbosum var. orbiculatum

E. corymbosum var. velutinum

Range map for E. corymbosum var. velutinum