Eriogonum flavum


Cat. Pl. Upper Louisiana, no. 34. 1813.

Synonyms: Eriogonum flavum var. polyphyllum (Small ex Rydberg) M. E. Jones Eriogonum polyphyllum
Treatment appears in FNA Volume 5. Treatment on page 371. Mentioned on page 333, 369, 373.

Herbs, matted, 0.2–4 × 1–10 dm, tomentose to floccose. Stems: caudex absent or spreading; aerial flowering stems erect or nearly so, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, nonflowering aerial branches, (0.1–)0.5–2(–3) dm, tomentose to floccose. Leaves basal, occasionally in rosettes; petiole 0.5–4 cm, tomentose to floccose; blade linear-oblanceolate to oblong or elliptic, 1–7(–9) × (0.3–)0.5–1.5 cm, densely whitish- or grayish-tomentose abaxially, mostly tomentose to floccose or glabrous and green adaxially, margins entire, plane. Inflorescences subcapitate or umbellate, 0.5–3(–5) × 0.3–2.5(–3) dm; branches tomentose to floccose; bracts 4–6, leaflike to semileaflike at proximal node, 0.5–2 × 0.2–0.5 cm, sometimes absent immediately below involucre. Involucres 1 per node, turbinate to campanulate, 3–9 × 2–5 mm, tomentose to floccose; teeth 5–8, erect, 0.2–1 mm. Flowers 3–7 mm, including 0.2–1.5 mm stipelike base; perianth pale to bright yellow, densely pubescent abaxially; tepals monomorphic, oblong; stamens exserted, 3–6 mm; filaments pilose proximally. Achenes light brown to brown, 3–5 mm, glabrous except for sparsely pubescent beak.


V5 764-distribution-map.gif

Alta., B.C., Man., Sask., Yukon, Alaska, Colo., Idaho, Mont., N.Dak., Nebr., Oreg., S.Dak., Wash., Wyo.


Varieties 3 (3 in the flora).

Eriogonum flavum approaches E. arcuatum morphologically in southeastern Wyoming, and a clear distinction is not always possible when the plants are immature or the herbarium material is poor.

Variety polyphyllum, as traditionally circumscribed, is an alpine phase of both var. flavum and var. piperi; it is encountered infrequently in scattered range in the high mountains of southwestern Montana and northwestern Wyoming.

Selected References



1 Stipelike bases of flowers 1-1.5 mm; usually w of Continental Divide; sw Alberta and British Columbia, n Idaho, w Montana, ne Oregon, e Washington, nw Wyoming Eriogonum flavum var. piperi
1 Stipelike bases of flowers 0.2-1 mm; usually e of Continental Divide; ec Alaska, s Alberta, sw Manitoba, s Saskatchewan, wc Yukon, Montana, w Nebraska, North Dakota, South Dakota, e Wyoming, and Colorado > 2
2 Leaf blades (0.3-)1-1.5 cm wide; inflorescence branches 4-20 cm; s Alberta, sw Manitoba, s Saskatchewan, Montana, w Nebraska, North Dakota, South Dakota, e Wyoming, and Colorado Eriogonum flavum var. flavum
2 Leaf blades 0.4-1 cm wide; inflorescence branches 0.5-2 cm; ec Alaska, wc Yukon Eriogonum flavum var. aquilinum
... more about "Eriogonum flavum"
James L. Reveal +
Nuttall +
Alta. +, B.C. +, Man. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Mont. +, N.Dak. +, Nebr. +, Oreg. +, S.Dak. +, Wash. +  and Wyo. +
Cat. Pl. Upper Louisiana, no. +
Illustrated +  and Endemic +
Eriogonum flavum var. polyphyllum +  and Eriogonum polyphyllum +
Eriogonum flavum +
Eriogonum +
species +