Eriogonum umbellatum Torr.
Sulphur-flower buckwheat, Sulphur-flower wild buckwheat, Sulphur buckwheat, Sulphur flower
Polygonaceae (Buckwheat Family)
USDA Symbol: ERUM
This is an exceedingly variable species with many different varieties & subspecies. Plant height varies from 3 in. to 3 ft., but all plants make loose mats of leaves, often green above and gray-woolly beneath. Leaves at base, and on long, erect stalks bloom tiny, yellow or cream flowers in balls at ends of branches of an umbel-like cluster. Flower clusters occur on 6-9 in. stems. The cream to sulfur-yellow, tubular flowers fade to orange or red.
Sulphur Buckwheat is highly variable, and this adds to the difficulties of identification in a complex group of similar western species.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Class: 1-3 ft.
Bloom InformationBloom Color: White , Yellow
Bloom Time: Jun , Jul , Aug , Sep
DistributionUSA: AZ , CA , CO , ID , MT , NM , NV , OR , UT , WA , WY
Canada: AB , SK
Native Distribution: Rocky Mts. (typical form) & other cold, western mt. sites
Native Habitat: Dry, mt. slopes & ridges
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry
Soil pH: Circumneutral (pH 6.8-7.2)
CaCO3 Tolerance: High
Soil Description: Gravelly soils.
Conditions Comments: Because the species is so variable, it is especially important to choose material from a habitat that matches your site.
BenefitConspicuous Flowers: yes
Value to Beneficial InsectsSpecial Value to Native Bees
Supports Conservation Biological Control
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
Butterflies and Moths of North America (BAMONA)Eriogonum umbellatum is a larval host and/or nectar source for:
Lupine Blue |
Learn more at BAMONA
PropagationDescription: Propagate only by seed as it is nearly impossible to transplant or divide the long taproots of mature plants. Plant seed thickly as germination is low.
Seed Collection: The three-sided achene can be hand-stripped from the plant.
Seed Treatment: No treatment is necessary, but a 3-month stratification may improve germination.
Commercially Avail: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
View propagation protocol from Native Plants Network.
From the National Suppliers DirectoryAccording to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Oregon Native Plant Nursery - Woodburn, OR
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Santa Barbara Botanic Garden - Santa Barbara, CA
Native Seed Network - Corvallis, OR
BibliographyBibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Bibref 995 - Native Landscaping from El Paso to L.A. (2000) Wasowski, S. and A. Wasowski
Search More Titles in Bibliography
Additional resourcesUSDA: Find Eriogonum umbellatum in USDA Plants
FNA: Find Eriogonum umbellatum in the Flora of North America (if available)
Google: Search Google for Eriogonum umbellatum
MetadataRecord Modified: 2013-05-29
Research By: TWC Staff