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Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat) Polygonaceae (Buckwheat Family) Semi-desert. Shrublands, woodlands, rocks.
Summer, fall. 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 stand out in the rocks of Canyon Country. Even in winter one can spot the plant 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". |
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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". |
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Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat) Polygonaceae (Buckwheat Family) Semi-desert. Shrublands, woodlands, rocks.
Summer, fall. At over four feet in diameter, this is not an unusual size for Eriogonum corymbosum. Flowers are in bundled masses along hairy stems. |
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Eriogonum corymbosum variety orbiculatum (Fremont's Rimrock Buckwheat)
Polygonaceae (Buckwheat Family) Semi-desert. Shrublands, woodlands, rocks.
Summer, fall. Brilliant white flowers fade to russets. |
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| Eriogonum corymbosum variety velutinum (Fremont's Velvet Buckwheat) Polygonaceae (Buckwheat Family) Semi-desert. Shrublands, woodlands, rocks.
Summer, fall. 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,
County Color Key
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Range map for Eriogonum corymbosum
Range map for E. corymbosum var. orbiculatum
Range map for E. corymbosum var. velutinum |
Species present in state and native
Species present in state and exotic
Species not present in state
Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Eradicated
Questionable presence
