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Montana Field Guide

Montana Field Guides

Sulphur-flowered Buckwheat - Eriogonum umbellatum

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Perennial from a branched caudex forming loose mats. Flowering stems ascending to erect, 5–40 cm. Leaves basal, glabrous to tomentose; the blade oblanceolate to ovate, 3–30 mm long. Inflorescence an umbel of capitate cymes subtended by a whorl of leaf-like bracts; involucres tomentose, 4–8 mm long with 6 to 12 reflexed lobes. Flowers mostly unisexual, 4–8 mm long, white, yellow, or red, campanulate with a long, tubular base; tepals glabrous, similar in shape; stamens exserted. Achenes 2–7 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

In MT we have the following varieties: umbellatum, aureum (Gandog.) Reveal, deserticum Reveal, dichrocephalum Gandog., ellipticum (Nutt.) Reveal, and majus Hook.

Species Range

Observations in Montana Natural Heritage Program Database
Number of Observations: 1156

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Sulphur-flowered Buckwheat — Eriogonum umbellatum.  Montana Field Guide.  .  Retrieved on , from