Eriogonum umbellatum var. umbellatum

Common names: Common sulphur flower
IllustratedEndemic
Treatment appears in FNA Volume 5. Treatment on page 339. Mentioned on page 338, 340, 346, 347.

Herbs, spreading mats, 1–3.5 × 2–6 dm. Aerial flowering stems erect, 1–2.5(–3) dm, tomentose to floccose, without one or more leaflike bracts ca. midlength. Leaves in loose rosettes; blade usually elliptic to ovate, 1–2.5(–3) × 0.5–1.5(–1.8) cm, white- to gray-lanate abaxially, less so to floccose or glabrous and green adaxially, margins plane. Inflorescences umbellate; branches 0.3–2.5(–8) cm, without a whorl of bracts about midlength; involucral tubes 2–3 mm, lobes 1.5–3 mm. Flowers 4–7(–8) mm; perianth bright yellow. 2n = 80.


Phenology: Flowering Jun–Sep.
Habitat: Sandy to gravelly flats and slopes, mixed grassland and sagebrush communities, scrub oak and montane conifer woodlands
Elevation: (1000-)1200-2700(-3100) m

Distribution

V5 674-distribution-map.gif

Colo., Idaho, Mont., Utah, Wyo.

Discussion

Variety umbellatum is widespread and rather common. Overlying a portion of the range of var. umbellatum is the glabrous-leaved var. aureum, but the latter occurs over a greater area and mainly much farther to the west. Still, clear distinction between the two is not always possible. Variety umbellatum is found in cultivation, especially in European gardens.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
Torrey +
Common sulphur flower +
Colo. +, Idaho +, Mont. +, Utah +  and Wyo. +
(1000-)1200-2700(-3100) m +
Sandy to gravelly flats and slopes, mixed grassland and sagebrush communities, scrub oak and montane conifer woodlands +
Flowering Jun–Sep. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Eriogonum umbellatum var. umbellatum +
Eriogonum umbellatum +
variety +